Cookieboro

I built a computer useing the below hardware and it ran fine for the full setup of windows and installtion of misc utilities. Then i rebooted and use it for about 1 hur to check it was running fine. But 1 day later it seems to have stoped working. When i press the power button the full system starts up but the screen dose not come on. i managed to get it on one time but no more luck. i set the jumpers for the cpu to 333mhz and showed xp2500 on the bios.
Dose this sound like i set somthing up wrong or should i be sending for replasment parts from the computer shop?

ASROCK K7 SIS 741 GX+
AMD ATHLON XP2500+ OEM BARTON
MAXTOR 80 GB 7200/133
LITEON 52X32X52 CDRW RETAIL BOXED
ADVANCE PSU 400 WATT ATX
E-machine Bare Bone Case, Keyboard & Mouse
256MB DDR RAM 266 Mhz PC 2100 184 Pin
Mentor K7-30 Copper Cooler Fan XP3000
GEFORCE FX 5200 128 MB AGP 8X

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OS: MS Windows XP pro (Version 5.1)
APGx8: Nvidia GeForce FX 5200 128 DDR
MB: Asus A7V8X-X
CPU: Athon(TM) XP 2600+ Barton (2.08MHz)
RAM: 512MB DDR Ram
HD1: Maxtor 160gig 7000
HD2: Maxtor 15gig 7000

Praetor

Check voltages and memory.

Is is supposed to be clocked like that?

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ASUS P5K Premium WiFi-AP, Q6600@3.7 / ASUS P5ND, E6400@3.8
4GB OCz Platinum XTC 8500 / 4GB CorsairXMS2 6400
5x500GB Seagate 7200.10 / 2x500 Seagate 7200.10
OCz 8800GTX 768MB @ 630/800 / 2x Galaxy 8800GT SLI