my computer boots for 2sec shuts down n boots back up again but does nt give me any video screen
motherboard: Intell Dp45sg
Processor: Core 2 Duo e8400 45nm 3.0ghz
RAM: Corsair XMS3-1333 2048mb 1333mhz
Graphics: Ati X1650pro 512mb
Tower (if it matters):Aspire Black X-Cruiser Case ATX Mid-Tower

As soon as i flip my power supply on my whole system boots up with out me hitting the power button in the front please help. also the board is susposed to at least let u know if its a board or ram ISSUES but neither of lights for these have ever come on.New build ?
MBoard standoffs in place ?
Thermal compound installed correctly ?
New or used PSU ?

Lot's of missing details and it's a BIT foggy today so we cannot see the machine from here...yes its a new buld but it was working fine till this n yes its a 2 1/2 year old power supply and ive use it through all my buildsPossibly a load of cr*p, but may be of help. What are the post test sounds, if any

ASUS Motherboard Beep Errors:

Award and Phoenix BIOS:

1 short beep: Normal
2 short beeps: CMOS error
1 long and 1 short beep: DRAM error
1 long and 2 short beeps: Video card error
1 long and 3 short beeps: Keyboard error, or video card error
1 long and 9 short beeps: ROM error
Long continuous beeps: DRAM not installed correctly, bad memory, or incompatable
Short continuous beeps: Bad power supply

AMI BIOS:

none power supply, motherboard, or PC speaker is no good.
1 short system RAM Refresh failure.
2 short memory error
3 short same as 2 beeps; follow diagnosis above.
4 short system timer error
5 short cpu Failure. REPLACE the CPU or POSSIBLY the motherboard.
6 short keyboard error
7 short cpu or motherboard error
8 short video card error
9 short rom checksum error
10 short cmos error
11 short cache memory error
1 long, 3 short memory test failure.
1 long, 8 short Display test failure

Regards
I'm glad mentioning missing details produced a one sentence reply that did nothing and answered only one of the questions posed...it doesnt make any error sound when it trys to boot up im prety sure its my pwer supply anyway THANKS for the help if its nt my powersupply ill be back