PC won't boot - no POST

[warnac]

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1 ASUSTeK P5P800 (Intel i865PE)
1 Intel Pentium 4 530 (3.0 GHz) Socket 775 0.09 micron FSB800
1 Maxtor DiamondMax Plus 9 120 Go 8 Mo 7200 RPM Serial ATA
1 Corsair Value 1 Go (2x512Mo) DDR-SDRAM PC3200
1 Point of View GeForce 6800 GT - 256 Mo TV-Out/DVI
1 Plextor PX-116A - Lecteur DVD/CD 16/48X IDE Interne
1 Alimentation 500W PFC (2 ventilateurs)
1 NEC ND-2510 - DVD(+/-)RW 8/4/8/4x DL 2.4x CD-RW 32/16/40x IDE Noir (bulk)

Putting it al together ->nothing on screen ->MB LED ok >but no bips ->all fans are spinning ok
i've rechecked all connections - and the're all ok ...
Removed both Ata's - Rams sticks are ok ->tested on another MB
stilll nothing

Wat is the problem?

[ski]

Try a different monitor, or connect yours to a different system.
If there's a display on another monitor, or if there's no display on yours, then replace your monitor.

If the monitor is ok, then install/connect only the power supply, MB, CPU, memory, video card, monitor, case speaker, and power button, and make sure the power supply's voltage selector switch is set to the correct voltage and the PS connection to the MB is securely seated.

If there's no display, then clear CMOS with a MB jumper, or by removing the CMOS battery for at least 30 minutes.
If that's already been done, then make sure the 'Clear CMOS' MB jumper is not in the 'Clear' position.
If the jumper is in the proper position, then check the CMOS battery for the correct voltage(3V).

If no luck, then place the MB on a piece of cardboard. If there's now a display, then the MB is shorting out when installed in the case. Check for a loose screw, standoff, etc., inside the case, and also remove any standoffs which do not line up with MB holes. If none is found, then remove all MB screws and metal standoffs, and install paper washers(manila folder paper works good for this) between the MB and the screws/standoffs.

If there's no display with the MB placed on a piece of cardboard, then proceed with the following:

Test the following PS leads on the back of its MB connector making sure the connector is installed on the MB and system is powered up with the 'Power On' button:
yellow wire and a black wire- +12V
red " " " " - +5V
orange " " " " - +3.3V
If these voltages are not up to spec, then the PS is bad.
If you do not have a voltmeter, then try a different PS.

If the PS voltages are ok, or there's no display with a different PS, then either the MB, CPU, or video card may be bad.
Make sure the RAM is firmly seated, and install it in different slots.
Also, make sure the video card is firmly seated(some video cards need an extra firm push to seat properly).
If still no display, then swap out the MB, CPU, and video card to find out which one is defective.

[Jiggy]

Hi Warmac, Welcome to PC Guide.

Restart computer with only video, memory 1 stick in slot 1, cpu heatsink.

If it boots add back devices one at a time.

If no boot no display try using a lower spec (pc2100-pc2700) memory and see if it boots, if it does go in Setup/BIOS and up your memory timing to match your pc3200 (check manual).

[warnac]

I'm sorry guys
but i already turned in the pc to the hardware vendor of the CPU
I'll have news next week and will post the solution here
Thanks anyway for youre help