Really weird reboot problem. I'm stumped.

[Black88GTA]

My computer is acting up. It's been on for the past week and a half straight, with absolutely no problems. Then, yesterday, when I'm on the internet, I click a link to a message post here on AT and the PC reboots, just out of nowhere. When it reboots, it shows the drive detection screen, like it always does....but when it gets to the part where it lists the hard drives, my main drive (WD250GB) is not detected, but the other 3 are. Then it says NTLDR not found and stops booting.

So then I ctrl-alt-del to reset, and the same thing happens (NTLDR not found). Then I turned the power completely off, waited 20 seconds, and powered it back on. It booted right up normally.

So, I thought it was just a fluke, but it happened again just now :|. The same exact thing. Could the hard drive be causing this? The drive is only about 3 months old . I haven't noticed any weird noises or anything out of the ordinary from it, except for this.

Any ideas?

**EDIT: I forgot to mention that all 4 HDDs are running off of a Promise ATA100 PCI controller card that came with the 250GB.

Specs:
Abit KT7-RAID
xp2400+ @2.2Ghz
768MB generic ram
Albatron GF4200TI 128MB
SB Live! 5.1 digital w/ Live drive
Antec TrueBlue 480 PS
WD 250GB
WD 60GB
2x Maxtor 10GB
Zip drive
Floppy
Linksys NIC
Lite-On CDRW
BTC DVD-ROM

 

[Sheriff]

XP won't reconize 250gig as a whole unless (maybe) SP1 is installed

 

[Black88GTA]

It's been running fine with it (and recognizing it as a whole) since I installed it 3 months ago. I'm running Windows XP and do have SP1 installed. However, I'm using the controller card which has large drive recognition built into it so it should work even if I didn't have SP1 installed. I just don't get why it's starting to do this now.

 

[Black88GTA]

Anyone?

 

[JustAnAverageGuy]

Try a different IDE cable.

 

[Alkaline5]

Power issue? That's a hefty power supply, but you never know... Use Motherboard Monitor and see if your rails do anything strange when it crashes.