I believe I had this exact same problem building my computer.

Note: I am not responsible for the events that occur after if you choose to do this.

Anyway, when I replaced my mobo, I had a similar or exact same problem.
The only thing I did to fix this problem was to reset the CMOS and use a different power supply if all the fans run after resetting the cmos but still no screen.
After doing this, be sure you have a backup copy of your OS if you need to repair the OS, don't worry, you shouldn't lose your files unless you format.

ALSO, if that solution doesn't work:
Make sure your motherboard is mounted on the metal mounts it came with. OR
make sure you don't have any thermal compound on the cpu pins. OR
Make sure your screws aren't too tight.

 

short or psu is not up to it

 

I would imagine that your not getting enough power, it start booting stuff up runs short then cuts out. You would have to be more specific as well though, is the motherboard a 20 or 24 pin, and how much wattage is your PSU.

 

got the computer up and running now. But have a new problem.

The first problem was fixed it was the 12v 4 pin needed for pentium wasnt working the the psu so the motherboard couldnt get enough power to start up. So i used my old 400w psu which is a 20xpin psu.

The motherboard is actually a 24 pin atx connection + it has a 12v p4 required power. But u can use a 20xpin psu in the meantime.


New problem is my motherboard supports ddr + ddr2.

but right now the motherboard is only working with my geil value pc3200.

When i put my crucial balistix 1gb (2x512mb) pc5300 i get no loading screens of any kind. Any i got a suggestion on my new problem?

could this be related to the psu not having enough power?. The motherboard is a p5gdc pro and according to the crucial memory selector it's compatable.

As the board can support up to ddr2 600

 

I wouldn't mix the ddr and the ddr2.

 

yeah but if i remove all the ddr it wont boot when im only using the ddr2 crucial balistix? wont even get the boot screen (eg with press delete etc)


but works perfect with the ddr ram installed

 

Hmm, I'm not sure, I've never had a ddr2 board. I'd check with the manufacturer,
and check if its in the right slot. Also, you might need two sticks, since its Dual Channel.

 

yeah they are both matched slots and ddr2 is 240 pins so u cant put it in the wrong slots etc.

so they are both 2 x 512 dual chanell dimms, i've tried 1xdimm in each slot and then the other in both slot and then 1 in each slot then swaping them still the exact same?

pretty confusing

 

This is a complete guess, but the motherboard it self may not support DDR2 memory type. Also if its a native 24 pin motherboard and you have a 20 pin PSU converting to a 24, you probably want to invest in a new power supply. Its expensive, but for 150$ canadian, the OCZ Powerstream 520 Watt SLI Ready gets stuff done. Perfect for overclockers.