Please help, I just upgraded my video card and PSU, and now my OS (windows 8 pro) won't start.
I can see the 'Gateway' screen on the monitor bur after that, just an annoying black screen.
I might have forced some connectors in and out the mother board, and I'm worried I could've damaged something. Also, the SATA connector plug that came with my new PSU wouldn't fit in my HD!! so I really forced it in (after reading a post in this very same site that said the ONLY solution to this was doing so).
Is it possible that a forced connection of the SATA cable to the hard drive is affecting it's performance and preventing the OS to start? Or did I damage something while installing my new cool hardware???
Test one new component at a time.
Does the PC boot with just the new PSU and using the Intel GMA 900 integrated graphics? If it does then the hard disk drive works. If it doesn't then you may have a boot device problem and will have to remedy that first.
If you can boot from the hard disk drive then power down the PC and unplug the AC power cable. Re-install the discrete graphics card and power it back on.