Problems with a GA-P55-USB3 mobo

rtatts

rtatts

rtatts

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Surrey, england
HELP.

The history behind this was my mate's computer stopped booting. After spending a long time it turns out it is the mainboard. He was running 2 x sapphire x1950 PRO PCI-E 512mb cards in crossfire.

We bought a new gigabyte GA-P55-USB3 rev 2.0 board, i3-540 and 4gb DDR3 RAM.

I put the system together to get no output on screen at all. I have tryed one card at a time and both in crossfire. Nothing at all. I have connected up the right 6pin psu connections and on the main board the 12 pin connector and the 2 x 12v 4pin connections too.

I tryed with a 8400GS 512 (gigabyte) and i can go into the bios fine.

What am i doing wrong?

Any help would be much appreaciated.
 
If you can get into BIOS using the 8400GS card then you have eliminated the motherboard as the issue.

PSU might be a problem, I have no idea what your mates spec's are so it is impossible to give any kind of constructive advice.

But some things you could try.

Check each and every connector from your PSU. Often what happens is that a metal pin in the connector will shift. Make sure each one is firmly in place. Visual inspection is normally fine for this.

Use the manual to connect the Power connectors. I got a bit confused when you spoke about the 8pin 12v CPU connector and then spoke about the 2x4 12v CPU connectors in the same sentence as PCI-e connectors. It is possible that you guys simply have one connector out of line or in the wrong place.

Last thing. Can you test that the cards work on your system. I suggest that because the 8400 card worked.
 
The Graphics was showing up on his old mobo and i am away from my computer for the next couple of days so can not do that at the moment. but i have tryed each and i would be surprised if they were both faulty

With the same connections. Checked the PSU connectors and they all appear find. I have also tryed with another PSU and the same results.

So the connections i have plugged in are:
1x24pin onto the motherboard (this is the one i stupidly called the 12 pin connection up top, What an idiot)
2x4 pin 12v ATX connections.
1x 6pin gpu power and thats it.

Is there an issue taking cards out of crossfire and stright in on there own?

Many thanks for your very fast responce 1Day
 
Just done more research. people are saying the sapphire x1950 pro 512mb is not compatible with the GA-P55-USB3
 
Yeah it seemed kinda weird to me that the 8400 card worked but the others did not.

Might be a good idea to shoot a enote or email off to Gigabyte technical support. Maybe they have a fix. Sadly if the card is not compatible (first time I have come across that mind) then not sure what to do.
 
So. Turns out the GA-P55-USB3 board is NOT compatible with Sapphire ATI X1950 Pro 512mb.

I have gone out and got a more basic gigabyte board and bingo it works fine.

so just a heads up. And yes i know the x1950's are out of date but still worth letting those no. Good bye to the wasted board.

Many thanks 1Day for your fast responce
 
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