No signal to monitor after start up

Hey Guys

I use duel monitors. One small one which is 1280 x 1024 and a large one whih a 26 inch tv and it is 1360 x 760. I've often given the large monitor to my little brother so he can use his xbox and I just use the small single monitor. But this time when I gave it back to him after I tabbed out of a game I just list the signql with.the screen. At first I thought it was some error with the resolution so I restarted my pc and after the start up and everything that shows up before the log in screen it looses it's signal. So I got the large TV back and plugged it in (by the way I use a Micro HDMI cable for this screen and a vga cable for the small monitor and they are both connected into my GTX 650 graphic card) and then it started working again. After I unplug it from the pc the small monitor looses connection. So it appeared to me that I needed duel monitors to use my pc. So the next day I go to turn on my pc and start it up and now both screen aren't getting a signal. I searched all around the web for a solution but all I got was stuff I already atempted. I tried cleaning my Ram, taking out my CMOS battery for about 30 minutes, unplugging the power and holding the power button for 30 seconds but still nothing. I tried a new monitor from my older brother and it worked and it still had that strange problem where the one of the monitors will only work if it has another monitor connected. I have no other monjtors to use so I have no idea what to do so hopefully someone will have a solution so I can back to my work.