on boot up? If so can you start in Safe Mode.
Is your PC available to everyone? If not, why a password? You can now see the problem.
Since you didn't tell us the OS . . .
I have a Gateway GT5058 Desktop PC which was working fine until the other day when by accident I pressed the battery backup's on/off button and turned everything off. When I turned everything back on, my monitor showed a "No Signal Found" error. The hard drive made the usual noises when I turn it on and then the noises stops. I think maybe because the OS is prompting for the password??? I always use a password to secure my PC.
I tested the monitor on another computer and it works fine so it is not the culprit. I thought the Radeon HD 4350 graphic card went caput and removed it and installed in another computer and it works fine. I even tried using my PC's integrated graphic connection and still I get the same error. So again the culprit is evading me. I'm suspecting the Bios is the culprit but I'm not sure. So what could be wrong?
Please HELP! I need my PC really badly or I die!!!! Well not that bad but still I need to get it to work asap. Thanks!!!