Posted 28 December 2012 - 08:53 PM
If the computer is booting to that point, chances are you installed the hardware correctly, but there is, like Louis said, a conflict with the OS. Reinstalling Windows is required which brings up another issue: Licensing.
Microsoft loves their Byzantine licensing. If you are using a copy of Windows from an OEM, like Dell, HP, or Sony, you cannot reuse it again with a different motherboard. The OEM license designates the motherboard as the PC and is not transferrable to another PC, so, new motherboard, new PC. Note, there is nothing technically preventing you from reinstalling the OEM version of Windows, just the license. You can also do a clean upgrade install on that drive from Windows 7 to 8 if you want. Full, boxed, retail versions of Windows may be moved from one PC to another but they will most likely require a telephone activation.