How to confirm that the graphics card is compatible with this motherboard

dumb_man

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This is a customer's PC. The motherboard which had a Core i5 2400 processor and 8GB of RAM failed. I bought a new Gigabyte GA-H61M-S motherboard as replacement (H61 chipset). The PC boots up correctly with this motherboard which has a PCIE x16 slot. The PC has a 400W gaming SMPS installed in it from before.

The original PC also had a Gigabyte GV-R787OC-2GD installed. My customer says that he checked it at a friend's home a month back and it was OK. However, when this graphics card is installed in the new motherboard, the PC does not boot up, the display remains blank and all 3 fans on the graphic card keep spinning.

How do I confirm where the problem is? Could there be some compatibility issues between the new motherboard and the old graphics card?
 

4745454b

Titan
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Usually it's the other way around. Old board with new GPU. My first thought was not enough power. The 7870 needs two 6pin PCIe plugs which aren't normally found on 400W PSUs. Try hooking it up to a good PSU and see if it's just a power issue.
 

dumb_man

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Yes, this power supply has the two 6 pin connectors required to power this graphics card

 

dumb_man

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Agreed - however this graphics card was working with this 400W SMPS until the motherboard failed.