As a random thought, try disabling your AV/firewall if you have one, and you can do that long enough to be useful. And anything else you can think of that's not running in Safe Mode. (Internet disconnected, normal mode).
And download and run 'Don't sleep' (easy to find). That should (??) eliminate sleep- unless something unusual is going on. So if hte screen still goes black, then it's probably not a sleep issue.
Hi, don't despair quite yet.. it took me a few days and interventions to get control of high CPU use + 2 upgrade attempts 'cos of a program I had installed in Win 8.1. Then more effort to make it look reasonable from borderless windows with white title bars at that time.
Now you said it's ok in Safe Mode.
Really before making lots of test changes, use disk imaging e.g. Macrium Reflect so you can easily get back to where you were- and create the boot disk for that program.
(Hopefully you have a disk image of Win 8.1 before you upgraded)
Now, I'm wondering about scheduled tasks. Something that kicks in say hourly based on the time you quoted?
Have a look and see if anything is triggered that might be incompatible. Disable any tasks that might fit.
Try Sysinternals Autoruns and examine your startups- check there's nothing that looks obscure. You could try disabling all startups in task man, and disabling anything else you reasonably can via Autoruns.
You really need to try clean boot now, as you have not really tried this yet.This will determine better then making another user account in my opinion. Determine more if the cause is from software conflict (running at starting up), software drivers conflict, as you are eliminating all other processes except Microsoft. Plus you have to run it for awhile as this issue is not consistent all the time,but random.This is not an easy issue to figure out, take each step at a time. Also been no BSOD errors to analyze i also see.
Check the Event Viewer from Custom, Administrator Events, to see if it was being logged there or any other information can help you determine the cause.
If turned off sleep mode and you changed the Power Plan to High performance in Power Options. Also suggest to turn off hibernation, can do so from Admin command prompt, copy and pasting this
powercfg -h off
If later you want to turn it back on, use this powercfg -h on
I would not rule out this could be also a hardware issue, Video card, Power Supply or Hard drive.
Possibility leaning towards the Video Card. Been awhile since i seen a motherboard with no integrated GPU.
As there are tests can do to check hardware, but i would first use clean boot.
Motherboard is an older model ASUS P5N32-E SLI, with 1.8GHZ CPU and DDR2 RAM. Back from 2006, so if running a lot on this can be cause to some of your issues along with being a new OS and no new drivers for system past Windows 8.1, as i told you before to look for updates. Windows 10 may have some within OS,but other may need to be researched from there respected Manufactirer's web site.
If it is possible, do not think so, but if you do have Fast boot on this BIOS, go into the BIOS and disable it.
I booted into Safe Mode - which was Windows 10 - and went back to MSConfig and eventually found a way to deselect 'Use original boot configuration' (it was greyed out for a while). However, on restart, it still showed me the old options, i.e. no sign of Windows 10 Pro. The only way I can currently boot into Windows 10 is via Safe Mode.
So, before I continue with your excellent suggestions, how do I sort out my boot problem?
Many thanks for your help (everyone).
Microsoft chap has said there's no alternative (because there's no Refresh option under Settings - Update & Security - Recovery) but to reinstall Windows 8.0, then upgrade to 8.1 and then Windows 10. Balls to that, frankly.
Any ideas? Given that I can still - sort of - boot into Windows 10, the correct MBR, etc., must still be on my C drive somewhere, surely? I've tried booting with a Windows 10 DVD and using the Repair option (but it then thinks it's a Windows 8 machine...) and making changes with Bootsect, but to no avail.
I really, really don't want to go down the thermonuclear route...
(Am pondering the Reset or Roll Back options... I've got nothing to lose.)
Funny mine was doing that before I upgraded from windows 8.1 but since BIOS and drivers been updated in windows 10 have not had one freeze or any problem for 3 weeks.