I have a custom built computer that has has been giving me problems lately. A summary of my system:
AMD Athlon 64 3200+ CPU
NVIDIA GeForce 6500 Video Adapter
Maxtor 160GB SATA Hard Drive
Western Digital 320GB SATA Hard Drive
IDE DVD Lightscribe
550W Dual Fan Switching Power Supply
Windows XP Pro/SP2
What my problem is, is that the computer keeps turning off unexpectedly. When it does, it will try to reboot but when it does it won't find any hard drives. I know this because none show up in the BIOS although my DVD drive does, and it is and IDE device. A message will come up saying: DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER. Well I know there's nothing wrong with my Operating System, it just can't find the hard drive. It has been doing this for a few days all of a sudden. I have several times turned the power switch off of the PS and held in the power button to dissipate any power on the board and then restarted the computer and this has worked many times, so I know everything is still there.
Then the BIOS will detect the hard drives. After that it will boot up and be ok for a while until it does the same thing over again. This morning, sometime through the night, it happened again. This time I had to change around some power connectors and finally got it up again and it's working fine for the moment.
This is a new power supply so I'm trying to rule that out, but it just seems that it is not getting power to my hard drives even though I know it is cause the system is up and running fine when it is.
The hard drives would probably not show up in the BIOS if either they were not receiving power, or data I think, but the only common connection that was linked to both of my hard drives was the power cable that I was using to connect both of them together.
I've checked the event log and although there are some errors and warnings, it doesn't correspond with the time the computer went down. It shows it's ok at 2:30AM then nothing till 10:22AM, when I got it back up again.
When my computer is up and running it works great, but then there's that time when it seems to lose power, so how can that be? If there was no power coming through my connections it would never start . I'm just so frustrated and confused.
I had thought about the CMOS battery being bad or dead but after the computer is up, shouldn't it be ok? I hope someone knows or has some good idea what the heck is going on with my computer. HELP!!!!!!!!!!!