New build but no display

[ndat911]

hi my new built computer won't boot. Here is the specification:
M3A78 motherboard
GTX 260 video card
2x DDR2 ram
athlon 64 x2 CPU
Rosewill RP 550-2 psu (550watt)
and using my old SATA HD + CD/DVD drive

can some please help? I was thinking bout the psu doesn't have enough A or voltage for this build.

P.S everything was running but no display or no post.

 

[mailpup]

The graphics card requires two PCI-E six pin power connectors. Are they both connected to the power supply? The power supply only comes with one PCI-E connector.

 

[ndat911]

yes, i had 2 of 6 pin connectors connect to the graphic card (the 2nd 6 pin came from the graphic card box)

 

[mailpup]

It might be weak power supply with only two rails of 18A each. What kind of DDR2 RAM and which M3A78 motherboard? There are several different ones.

 

[ndat911]

this is my mobo (sorry, i can't link cus i'm new here, need 3 more posts) ASUS M3A78-EM AM2+/AM2 AMD 780G HDMI Micro ATX AMD Motherboard and rams are kingston ValueRAM 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 533 (PC2 4200) Dual Channel Kit Desktop Memory.

P.S on my mobo manual it says make sure the the 20-pin power plug can provide at least 15 A on +12 V. I'm also using 24 pins (the main connector is actually 20 pins but also there are the 4 pins next to it which i connect to the ATX power connector) + 4 pin ATX12V.

 

[mailpup]

The + 4 pin connector from the 20 + 4 pin motherboard connector is not the same as the P4 12V connector that goes to the motherboard. Although there are 4 pins on each, the voltage/ground pin arrangement is different. So you might have used the wrong PSU connector on your motherboard's P4 12V connnection.

BTW, I count 24 pins on the motherboard main connector. Use the full 20 + 4 pins on it.

 

[ndat911]

the psu was ok. Anyway I tested my mobo by removing all gpu, hdd, cd drive, ram etc... except for cpu and its fan. There was no beep sound. So I guess it's a bad motherboard then.

 

[AudioVayne]

Coulda been RAM? Did you try 1 stick at a time or another stick from elsewhere (if possible)?

 

[ndat911]

Ty for the replies guys. Confirmed it was the mobo fault. RMA it and got another new brand one all worked well!