I'm going to offer a ton of information, because I've googled the heck out of this problem and nothing works for me. There are MANY symptoms, but I can't put it all together for a fix.
*I added a Radeon 7770 graphics card to my Gateway DX4860-UR28
*My Windows 8 system no longer has any sleep option. When I perform a powercfg /a from cmd, it says: Standby (S3) / An internal system component has disabled this standby state./ GRAPHICS
*I've updated to latest drivers, both trying vanilla microsoft and Catalyst drivers, neither fix the issue
*Other (maybe) related symptoms include:
*I can NOT see boot screen or BIOS, but once booted into Windows I get sync. I even brought in another monitor to check things out. I've tried HDMI and DVI from Radeon 7770 and I've tried HDMI and 15-pin Dsub from integrated graphics and could NEVER get anything during boot while in BIOS (I know I was in BIOS because I hit [DEL] and the system never booted into Windows)
*Windows sees a non-existent monitor, but Catalyst does not. This non-existent monitor is called "Generic non-PNP" and Windows likes to extend my desktop onto it (but that doesn't go anywhere because it doesn't exist!)
*I'm powering my 7770 with Molex to 6 pin power adapter, but I *think* I'm ok on power because I've run furmark and superpi simultaneously and system is stable during benchmarks
*I've already removed my MB CMOS battery for 30 minutes hoping that would help, no dice