No video out of I/O DVI ports

Hi, I have an HP Pavillion 500-070. My hard drive failed, so I replaced it with a SATA 2 1TB Western Digital Blue. But now whenever I boot the machine, everything goes normally. Fans spin up, hard drive indicator flashes, no beeps, but no video. I'm using the default video ports on the board, so the intel HD 2500 chipset. I know its not my DVI to VGA converter, I tried it in my old PowerMac G5 and it works, same with the monitor, It works with my PowerMac G5. I read that it could be bad RAM or a bad DIMM. So I tested the RAM, moved stuf around, tried an old 1GB RAM stick, all the same results. I then read that it could be a dead board and to test it to take out the RAM and see if it beeps on boot. If it beeps, the board is okay, if not, thats a sign of failure. So I tried it, and it beeped. So it seems like everything should work, but it just doesn't. In the mean time I am using my old PowerMac G5 7,3, but it's old, slow, and almost no support for modern programs. So I'd like to get my HP back up ASAP.
Thanks, Tyler
5 March. 2015
PS: I sent a customer support thing as well.

While doing the hard drive replacement, did you use Recovery disk set to reinstall the OS or use a Windows install?? I see that unit came with Windows 8, is that what is still installed?
I would start with drivers for the chipset, if you did not use the Recovery media
HERE is the Drivers page, if you need drivers
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No video out of I/O DVI ports

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