Safe Mode loads only a minimal set of drivers and services. Unlike VGA mode it loads the generic windows graphics drivers, whereas VGA mode uses your installed graphics driver in VGA mode.
That may be a way forward - enter Control panel, Display, settings and reduce colours to 16 bit and say you are on 1200 x 1024 reduce.
What was the result of the clean boot and the analysis.
IF you have not already done that - it is I am convinced AFTER the suggestions from my colleague the way forward
I feel the proof that this is the way forward is the success in Safe Mode.
Albeit that it may still transpire to be a fault not covered by the clean boot analysis, but due to the far less drivers and services loaded in Safe Mode and indeed the smaller demand on the power requirements.
IT MAY turn out to be a power issue.
Re Firefox it is on the HELP tab, as I mentioned
Go Firefox on that edtion I think you click the help tab and then configure Safe Mode NO add-ons - try that.
Safe Mode is a special Firefox execution mode that can be used to troubleshoot issues in Firefox. In Safe Mode, you can reset some settings or disable add-ons that might be the source of the issue. By comparing Firefox behavior in normal mode to its behavior in Safe Mode, where various items are disabled, you may be able to diagnose issues.
Note: Windows users may be familiar with a Safe Mode for Windows. Firefox Safe Mode has no connection to Windows Safe Mode.
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At the top of the Firefox windowOn the menu bar, click the Help menuFirefox button, go over to the Help menu and select Restart with Add-ons Disabled.... Firefox will start up with the Firefox Safe Mode dialog.
For Windows XP, click the Help menu and select Restart with Add-ons Disabled...