Hi guys, posted once about this but got no replies. Looking at my post is was quite drawn out as wanted to include everything, so here's the short version
Trying to get a Radeon HD 5570 to work on a Asus P8H61 mobo.
Graphics card works fine in my existing machine (P5Q PRO) and my other graphics card works fine on the P8H61 mobo - so seems the actual hardware isn't the issue.
Sometimes the PC boots fine (generally after changing something in the configuration / settings the first boot is OK) then relapses into not booting - No display on monitor and beeps (one long, 3 short) from mobo.
What I know...
When used separately, graphics card and Mobo seem to work fine
Fresh install of windows 7 (its was also doing it before the install on windows xp)
Power is NOT the issue, tried with existing 350w PSU and also bought brand new 750w psu. Also HD 5570 doesnt have aux power connector
No hardware conflicts in device manager (initially had 'simple pci communications interface" issue, but resolved)
Any ideas guys? Was wondering if it could be something to do with the onboard graphics on the H61 chipset - but then again other cards work fine (have tried 7600gs and HFD 4670 with this mobo)
Hey again, just confirming I've tried now in both PEG -> PCI, and PCI -> PEG and get the same issue with both configurations.
At my wits end hehe, it's my friend's computer (he has had the graphics card running fine in another motherboard for 2 months, and just replaced with a sandy bridge combo). I would advise him to return the motherboard but it doesn't actually appear to actually be faulty so not sure where he'd stand.
Hehe, PEG = PCI Express Graphics - now it makes sense, I guessed PEG referred to the mobo's built in graphics - D'oh!
In any case, both settings made no difference but I have now found the issue!
After trying everything and deciding there was absolutely nothing I could do, I decided to test the rig with my own PSU, and hey presto, it boots every time!
Even though it was the simplest, it was the last thing I checked as the PSU was a brand new 750w unit, which had been bought to replace the one my friend initially thought was the culprit. Who would have thought both PSU's would have the same problem?
Let this be a lesson to anyone out there buying a PSU (as if there wasn't enough information out there already!) - Do not skimp on price! Thing is with his rig, he could have spent the same on a quality 400w system and not had any problem.