In my experience with similar situations, it was almost always a faulty HDD. Just as an experiment, boot it up cold and press whatever key yours uses to get into your BIOS settings. Let it sit there for about a minute or so, then exit. Does it boot OK then, or do you still get the same errors? If it boots OK, then it's likely a HDD problem. SC Tom

I had suspected the solid state disk that was in the original configuration but when we moved MB, CPU and RAM to new case there were also 2 different (not new but different) HDDs, and same problem. We did try going into the BIOS settings screen and leaving it for a few minutes thinking it might warm up but it still gave the Blue Screen and then booted happily after a restart. New memory should arrive today and it has been off since yesterday evening so I will put the memory in and see what transpires!

In my experience with similar situations, it was almost always a faulty HDD. Just as an experiment, boot it up cold and press whatever key yours uses to get into your BIOS settings. Let it sit there for about a minute or so, then exit. Does it boot OK then, or do you still get the same errors? If it boots OK, then it's likely a HDD problem. SC Tom

I had suspected the solid state disk that was in the original configuration but when we moved MB, CPU and RAM to new case there were also 2 different (not new but different) HDDs, and same problem. We did try going into the BIOS settings screen and leaving it for a few minutes thinking it might warm up but it still gave the Blue Screen and then booted happily after a restart. New memory should arrive today and it has been off since yesterday evening so I will put the memory in and see what transpires!

A year ago I built myself a PC with a Gigabyte GA-H55M-UD2H motherboard, i5-760 processor, OCZ DDR3 ram (4 gig), XFX ATI radeon graphics, a solid state drive as C and a 1TB drive as D for data. Installed Win7 32 bit. Next morning when I went to start it it crashed and rebooted halfway through the boot. I couldn't fix it so I re-installed Windows. But the problem persisted. It only happened when the PC was cold (left overnight or for a few days), as long as it was warm it would restart or shut down and boot again quite happily. But when cold it was a battle involving many restarts and diskchecks and sometimes corrupted files to get it going. It reached the stage that I was leaving it on all the time. Hoping to resolve the problem I moved the motherboard, CPU and RAM into a new case with new drives, new graphics card, new SATA cables. Installed Win 7 64 bit. Result - exactly the same problem! Have now learnt about telling the system not to do a reboot on system crash so now I get a BSOD but with a different stop message every time. I shut the machine down and reboot and it starts up quite happily and windows tells me it recovered from an error and would I like it to find a solution (but it never does). So it seems to me there is a component that doesn't work properly when it is cold - but when it gets a bit warmed up it is happy. But what could it be - motherboard, CPU, RAM? I already asked a question about claspnp.sys because before I learnt to stop it rebooting on system crash I inevitably ended up starting in safe mode and it stopped with classpnp.sys as the last thing loaded/loading. But the problem has moved on, a bit. New case has new 650 watt PSU. I have ordered new RAM to try that.