My motherboard is constantly conspiring against me, doing everything it can to ensure that my computer does not work. The worst of these issues, its that it refuses to boot my hard drive. It says "disk read error," but it is just framing the hard drive for its atrocities. I might have believed it, if it weren't for the fact that this issue happened with the last hard drive I had as well. Multiple fixes have worked in the past, but like a Cyberman, the evil motherboard adapts, forcing me to pile more extreme measures on top of each other. It started with just changing the SATA socket the hard drive was plugged into. Then I had to unplug the mobo from the power supply. Then I had to replace the SATA cable entirely. Then I had to remove the RAM and GPU. Then I removed the CPU and heatsink (cleaning them and replacing the thermal transfer compound, of course).
These fixes are now all obsolete, and I am out of ideas. Does anyone have anything? Please no "Just go buy a new mobo/hard drive/PC." If this were an option I would have done so already.
I have a Dell Dimension E520 that I have upgraded for entry level gaming performance. It's running a Core 2 Quad Q6600, 6 GBs of RAM, an R7 250, and Windows 8.1 (happened when I had Windows 7 too, so not an OS issue). It is also not a PSU issue, as mine has 680 watts.