I decided yesterday that with the free upgrade deadline approaching I would upgrade to Windows 10 Professional from Windows 7 Professional. I created some installation media first using the Microsoft tool, then did the upgrade to register my computer. Then I did a complete clean install using the installation media.
My problems began soon after I did the clean install. I was allowing it to download some updates from Microsoft, when the system seemed to crawl to a halt, like I moved the mouse then the pointed followed it slowly across the screen about 5 seconds behind. I couldn't click the start button nor did Ctrl-Alt-Del work so I was forced to hit the reset button on the chassis.
When I rebooted, it wouldn't load Windows, with an error message 'Bootmgr missing' or similar. My USB stick installation media was still first in the boot priority so I inserted it and re-tried but the same thing again. I thought this odd, then realised that it appeared that no USB devices were working. The LEDs on my keyboard and the optical mouse light were all dead, as was the LED on the switch on my USB microphone. Also the USB installation media stick has an LED which was not lit too. I did a CMOS reset and it booted ok into WIndows again.
About 10 minutes later a similar freeze occurred. This time I was guessing that I had a corrupted Windows 10 installation so I did another fresh installation. It was ok for several hours into today, the after I played a game for a while it crashed again, I could see the mouse cursor moving normally this time but the system was otherwise unresponsive.
I reset again using the switch but I got the same 'Bootmgr missing' error as before. I could get into the BIOS and saw that in my choice of boot devices, my SSD was not even visible. Also of note, during the POST the system seemed to be stalling a long time on the A2 code which I believe is relevant to SATA storage devices on my motherboard.
I have cleared the CMOS again and changed the SSD to a different SATA port on the motherboard and it had been good for an hour or so but obviously I'm not happy yet that it is resolved.
Does anyone have any suggestions please?
Edited by lonewolfer, 23 July 2016 - 08:54 AM.