Hi everyone, I'm not sure what part is causing my problems -- I've tried quite a lot. I'll put the most straightforward details at the top, and go into detail further down. Even an educated guess would really be appreciated. Hardware GA-Z97N-WIFI i7 4790k Crucial Ballistix Tactical 16GB (8GBx2) Gigabyte Geforce960 Samsung 850 EVO Corsair CX600M Power supply Corsair H100i GTX Windows 10 Professional Current situation "no signal" on start up (fans are spinning and the pump is working normally). Does not boot into Windows. Tried disconnecting the battery and shorting the CMOS clear jumpers. Situation in order from first to last #1 "No signal" one morning (Windows appears to load, but "no signal") Removed Geforce (no effect; "no signal") Reset CMOS by disconnecting battery & Loaded optimized defaults (success!)Windows loaded normally #2 Reinstalled Geforce "no signal" (signal did not come up when Windows loaded) #3 Removed Geforce "No signal" during BIOS Blinking cursor in the top left; system resets less than one second later #4 Disconnected and drained battery "no signal" #5 Shorted CMOS jumpers "no signal" (Windows doesn't appear to start) #6 Put RAM in opposite slots Drained battery "no signal" (Windows doesn't appear to start) I'm out of ideas - my best guess is the motherboard, but I have gotten it to work at one point. Like I said, any help -- even an educated guess -- would be great. Thanks very much!