Why won't my HP Desktop m9000t power up after hard drive replacement?
I tried to upgrade my hard drive, something I have done many times before. After installing the new drive, the computer will not power up. The only sign of life is the green light on the power supply when the machine is plugged in.
I tried swapping the original drive back in, but the computer is still dead.
I don't even know where to start to diagnose the problem.
Is this a good question?