My computer has always had this problem but lately its gotten a bit more frequent. While running at seemingly random times the computer goes into a bluescreen and before it has a chance to make any sort of dump it reboots, I don't even get to see the bluescreen for that long, and yes I checked for a MEMORY.dmp in C:\windows (where it's supposed to put dumps) and found nothing, the systems event logs just show a 'general' error which caused a reboot, nothing specific.
After going into the reboot process it hangs in a section where it says it couldn't find a hard drive and that I should insert a hard disk to continue.
If I hit 'restart' on the PC it does the exact same thing giving me the same error about a missing hard drive and I should put one in to boot.
So i have to turn the computer off then back on for it to successfully boot. The system is Windows 7 with a Core i7 2600K an Asus P8P67 Pro mobo with an Antec 1000W PSU and an nVidia GTX590, it has 4 hard drives, one OCZ 120GB drive, two 2TB Samsung drives and a third 2TB drive but I can't remember the brand (might be Hitachi).