PC Shuts Off A Few Seconds After "IDE Scan"

[Pyyro]

This is really frustrating.

Mobo: P5GD1-VM
RAM: 2 x Kingston 1GB 2.6V (DDR3 I think)
Graphics Card: NVIDIA GeForce 210/REV 1.1 x64 1GB DDR3
HDD: Seagate Barracuda 7200.7 80GB & Seagate Barracuda 7200.11 320GB
Power Supply: Thermaltake Purepower 500 NP

I start the PC, then after the first screen, the IDE scan comes up and reads this:

IT8200 ATAPI V1.3.1.591
Copyright 2002-2004 ITE, Inc. All Rights Reserved

Drive 0: 16xD DVD Dual (lots of space) UDMA4
Drive 1: Not Detected (Seagate should be here)

Warning!! An Ultra ATA/66 (or faster) drive is connected with a 40-pin IDE cable on the primary channel. Drive speed is downgraded to Ultra ATA/33 mode.

I have tried both drives, and neither show up. The PC also shuts down a few seconds after this message.

What do I do?

 

[Someone Somewhere]

RAM: 2 x Kingston 1GB 2.6V (DDR3 I think)

That's DDR... the board is somewhere around a decade old.

If you remove all the IDE drives (SATA only connected), does it boot?

Has it previously worked before? When did it stop working?

Some stuff in the POST issues sticky may help: http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[Pyyro]

When I remove the IDE drives, it boots and goes past the IDE scan. I got another error that I'm fully familiar with:

CMOS Settings Wrong
Chassis Intruded
Fatal Error... System Halted

This is the farthest I've gotten with this mobo. I got the system from my uncle. He said there might be problems and I was aware of this. I got a whole new graphics card, power supply, and DVD Drive for it. It worked one time when I first got it if I remember right, but this didn't last for long. Now I can't get into my BIOS either.