Category Archives: Apple

Apple Operating Systems and Devices

HP 7520 WiFi scanning not working in Mac OS High Sierra

If when installing the printer with HP Easy Start you get a warning that the scanner does not support “Bonjour” and continue you’ll end up with a working printer but no scanner!

In most cases this happens because you have a dual band router advertising 2.4GHz and 5GHz on the same SSID networks and the printer latches onto the 5GHz network. Simply put the HP 7420 scanner does not work on the 5GHz network.

The solution is to disable the 5GHz network or rename its SSID and ensure your printer does not use it, i.e. is connected to the 2.4GHz SSID. Once done uninstall the HP printer software using HP Uninstaller. Reinstall the printer using HP Easy Start. This time you get no scanner warning and end up with both printer and scanner working.


CA Useful Notes

Computer Active Useful Notes


35719 Sharpkeys – keyboard remapper
35663 ShutUp10 Tweek Windows 10 security settings in one place
35467 Win+X Menu Editor – Windows 10 Win+X menu editor
34569 Heatmapper produces WiFi heat map to find strongest WiFi
33034 Inatec 2.5″ HDD/SSD USB Enclosure
32799 Padlet – share content
32643 Captura – records Windows screen(s)
32442 Glasswire firewall – identifies programs that use your Internet, Elite 7day trial
31235 Android Magnifying Glass (IOS 31236)
30849 Appbuster Bulk Windows uninstall programs
30789 Search Companies House
29712 CloneApp Backup Windows App and System Settings default features
29899 MiTec Task Manager Delux – better Windows Task Manager
27353 Lasso to prioritise RAM for programs that need it
28329 NoBot AV scanner – use with AdwCleaner
28321 ControlMyMonitor colour tweaker, from NirSoft
28351 BleachBit remove hidden junk like ccleaner without paywall limitations
27011 Mpow’s Air Vent Mount <£10
26883 InSpectre Meltdown + Spectre detector and perf indicator – also disables patch
26868 Whocrashed 6.01 BSOD Analyser
26836 Cloudberry – remote access via web browser
25761 Google Backup&Sync 15GB free storage
26760 Drive Formatter – Wipe data
26400 DMEX Explorer tool ctrl-F1 menu to split windows
26359 W10 WinAero Tweaks
26358 Bootracer see which programs slow PC start up
25237 Windows Repair Pro
25199 Colorize Photos
24973 MusicBee +
24368 Wise Program Uninstaller
23038 AllDup free duplicate file finder

Tips & Recommendations
Weed out broken system files
Run Deployment Image Servicing and Management tool
dism.exe /online /cleanup-image /Restorehealth
Once finished, check with System File Checker
sfc /scannow

Useful Stuff
Virtualbox Snapshot – virtual system backup in seconds – fake email address – alternative =
O&O AppBuster – W10 app/program uninstaller which removes most stubborn apps – organise a get-together, send email link
WeTransfer instead of email attachment store file on their server and send recipient message + file link
MediaFire as WeTransfer but videos
Netgear Arlo Pro 2 camera inc 7 day online storage
Money Manager EX – replacement for Microsoft Money (support ended 2009)
Adobe Photoshop Express free Windows 10 basic photo editing app Back up installed software to move to another PC/OS
Moneypool – Paypal Group to collect money
Logitech MK540 coffee prof kb + mouse – wireless only
Fast DNS Extract text from screenshot
netsh wlan show profile “NETWORK” key+clear – Show WiFi password
netsh wlan show profile – Show WiFi networks
Notepad log book add .LOG to print time stamp on open
NordVPN best paid for VPN £9.10/mon
TunnelBear alternative free/paid VPN 1.5GB/mon with TWitter a/c free Unlimited Teamviewer alternative
Remove USB command line utility

Recommended Printers

  • Epson XP-7100 Expression Premium £145 – Small footprint and packed with features. Economical to run with re-manufactured carts.
  • Brother MFC-J5330DW £120
  • Epson WF-3720DWF £80
  • HP Officejet 8715 £150 – bit noisy, but fast
  • Canon MG5750 £55 – no ADF
  • Canon TS6150 £100 – no ADF
  • Epson EcoTank ET-2710 179.99 – no ADF. No manual controls. Must use supplied Windows CD to setup.

Budget Routers

  • ASUS DSL-AC68U £129

Stretch YouTube Video To Fit Browser Window

Fit a YouTube video in the browser window as follows:

Normal YouTube Video URL is

To watch in a re-sizable window without switching to Full Screen rewrite the above URLas follows:

Append your YouTube video ID to to display a re-sizeable browser window.

In other words replace /watch?v= with /v/ in the normal URL


Mac Very Clean Install

If your Mac has been attacked by a virus that can’t be removed or so much damage has been done that is practically unusable then the best course of action is to zap the main disk and install a fresh copy of MacOS from a bootable usb.


  1. Ensure you have a Time Machine backup. Also ensure you have iCloud configured to backup important app settings, e.g. Documents, Device Settings, Mail, Contacts, Keychain, etc. and everything is synchronised to the iCloud server.
  2. Make a list of the Applications directory as follows:
    • In Finder open Applications folder and press Command+A to select all apps, then press Command+C
    • In TextEdit, create a new document, select Format -> Make Plain Text from the menu bar, press Command+V to paste list of app names into the document and save as apps.txt.
    • Alternatively, if not many, write down the names of 3rd party apps to reinstall later.
  3. Create a bootable MacOS usb installer, e.g. High Sierra – see Apple Support instructions
  4. Skip to step 9 if  don’t want to delete all the system hard disk partitions.
  5. Create a Gparted Live usb
  6. Restart your Mac. On hearing the boot chime hold down the Option key until you see the Startup Manager menu. Select Gparted usb from the menu.
  7. From Gparted delete all partitions, e.g. EFI, Macintosh HD, HD Recovery. quit and shut down
  8. Remove Gparted usb
  9. Insert your MacOS bootable usb.
  10. Power up and let it boot straight from the usb and go to step 12 or if you have skipped Gparted partition removal wait for boot chime, hold Option key until you see the Startup Manager. From the main menu select Disk Utility and Erase the internal Mac HD then quit to main menu.
  11. Select Install MacOS and follow instructions. When it comes to Migration Assistant connect your Time Machine or Time Capsule (you will need a login password) backup drive. Then
    1. Untick Applications (to avoid reinstalling infected 3rd party programs)
    2. Tick Users
    3. Tick “Other Files and folders”
    4. Tick “Computer & Network Settings”
  12. Continue to restore your data and settings.
  13. Once macOS is installed and up and running clean up Safari by using the following instructions  Safari Manual Reset
  14. Carefully install required 3rd party programs – refer to text file in step 2.

Your Mac should now be clean.

MAC Cleanup

Check hard disk Integrity to rule out disk faults

Boot the computer up in single user terminal. On chime press Command + S and run file system checker and repair

/sbin/fsck -fy

Reboot as follows:

/sbin/mount -uw /


Repair Permissions

Open Disk Utility and choose your main hard drive from the sidebar (in most Macs there will only be one.) Now click on First Aid and Repair Permissions. This will ensure that all the files on your Mac have the correct permissions, which will help keep things ticking along.

From El Capitan onwards Disk Utility does not have this options. Instead you have to use command line version:

sudo /usr/libexec/repair_packages —verify –standard-pkgs /

sudo /usr/libexec/repair_packages —repair –standard-pkgs –volume /

Purge system and redundant files

Install CCleaner

Run as Admin as follows:

$ sudo /Applications/

Install Clean My Mac 3 (paid for app)  and select Smart Clean. Optionally go through the individual options

Remove unwanted Startup items

Open System Preferences and click Users & Groups. Now click on the Login Items tab to view which programs and services are launched when you first power up (or log in) to your Mac. Highlight an item in the list that you don’t want and click on the Delete from Login Items (‘-’) button at the bottom of hte list.

Reveal CPU Hogging applications with Activity Monitor

If you want to see what apps are using up your system open the Activity Monitor in the Utilities folder. Activity Monitor shows all the processes on your Mac (some of which you can’t, or shouldn’t, close) so click on View and Windowed Processes. Now click on the CPU button and the “%CPU” column to list all programs by the amount of CPU they are using. You can also use this to see what Memory, Disk and Network different processes are using.

Delete big, unused files (also an option in Clean My Mac)

Now that you’ve paid some attention to your applications, it’s time to look at the files cluttering your drive. You can use Finder to search for huge files. To do so, open Finder and select the volume you’d like to search. Next, choose File > Find (or hit Command-F). Click on the Kind pull-down menu and select Other. When the Select a search attribute window opens, check the box for File Size, uncheck any other boxes, and click OK. Change the “equals” pull-down menu option to “is greater than” and then change KB to MB. Enter a minimum files file size such as, say, 100MB. You can then delete any files that show up on the list that you no longer need — or move them to an external drive.

Remove Custom Preferences

Open System Preferences and check in the row at the bottom. This is where custom items are added to your System Prefernces and if you’re not using them then they are taking up your CPU. Right-click on an item and choose Remove From Preference Pane.

Performance Boost

  • Increase RAM to 8GB+
  • Replace HDD with SSD

Other Stuff

Read/Write NTFS Disks

  1. diskutil info “/Volumes/MyPassport” → display Node Name = disk?s?w
  2. hdutil eject “/Volumes/MyPassport”
  3. sudo mount_ntfs -o rw /dev/disk?s?w “/Volumes/MyPassport”

MyPassport = example volume name, \040 represents a space

Alternative method

sudo nano /etc/fstab

LABEL=My\040Passport none ntfs rw,auto,nobrowse

Eject then find hidden mounted NTFS volume in Finder > GO open /Volumes

MAC Terminal Command Reference

Repair WiFi – alternative solution

Turn Off Wi-Fi from the Wireless menu item

  1. From the OS X Finder, hit Command+Shift+G and enter the following path:/Library/Preferences/SystemConfiguration/
  2. Within this folder locate and select the following
  3. Move all of these files into a folder on your Desktop called ‘wifi backups’ or something similar – we’re backing these up just in case you break something.
  4. Reboot the Mac
  5. Turn ON WI-Fi from the wireless network menu again

If not fixed try these steps

  1. Open network preferences from your WiFi icon in the menu bar. Then click advanced. Delete the network that is giving you problems.
  2. Open Keychain (Utilities). Find the passwords that are stored for your particular network and delete them.
  3. Repair permissions using the Disk Utility.
  4. Reboot the computer.; re-enter your WiFi key log into the network.

Uninstall MacKeeper

Cancel your subscription via the integrated technical support chat before uninstalling – saves having to phone up afterwards. To uninstall quit MacKeeper  and drag the app in the Applications folder to the Trash can.

More details here from

Change Yosemite Mail Default Message Font Colour

This is a work around for setting the Message default font colour.

Create a signature with Mail -> Preferences -> Signature selecting the mail account and + button like the one below in blue or desired colour:



Joe Bloggs

Now when you send a new message this signature will appear. If you insert your message between Hello and Regards it will be blue.



AirPort Roaming Network Configuration

AirPort Network Diagram

AP Roaming Network  Diagram

The above diagram shows a home Airport network with wired (RJ-45) Airports in the Sitting room, Reception (Time Capsule) and Study (Loft) and a wirelessly connected Airport in the Conservatory connected to a HiFi system using a audio mini-jack port. Due to the proximity of the  Airport HiFi it wirelessly connects to the nearest AirPort Time Capsule in the Conservatory. The wired AirPorts are connected to  the LAN using a straight Ethernet cable connected to the WAN AP WAN Port port and nearest room RJ-45 wall port.

The room RJ-45 wall ports are wired internally to an 8-port Gigabit switch in the loft. The loft router is represented by the Internet green dot in above diagram. The router LAN port connects directly to the loft switch and its ADSL port to the telco broadband telephone filter.

Airport Configuration

Airports are configured using the AirPort Utility application

All Base Station settings are configured with a unique name, .e.g “AirPort Sitting Room” and identical login passwords.

All Internet settings are configured to connect using “DHCP”. This means the AirPorts will automatically get their host, DNS and gateway IP addresses from a DHCP server. In this example it is the loft router.


AP Internet – DHCP

All Wireless settings are configured with an identical Network name (AirPortNet), Password and Security setting.

The wired AirPort Network Modes are set to “Create a wireless network”.

AP Wireless Tab Roaming

AP Wired – Create WiFi

The wireless AirPort (AirPort HiFi) Network Mode is set to “Extend a wireless network”.

AP Wireless Tab WiFi Extend

AP Wireless – Extend WiFi

All Network settings are set to “Off (Bridge Mode)”

AP Network Tab

AP Network – Bridge Mode

Airplay is disabled on all AirPorts except the conservatory Airport HiFi.