I installed some additional memory last week because the desktop computer moved slowly. Now, the monitor shows black. I've hooked the computer to two different monitors and get the same result. It is an emachines computer, and I have taken the new memory out, but the monitor still doesn't work. It's like the monitor isn't connected to the PC, but the monitor works when connected to another PC.
I've turned off the PC, disconnected and waited for days, but the PC will turn on, make a few clicking noises, and continue to run without the monitor changing. Right now, nothing is connected to the PC besides the monitor.