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For reasons yet to be determined, your computer is not talking to your monitor.
This could be the monitor cable came loose from the tower (this is our favorite, because it is such an easy repair), or something on the motherboard (that is, anything) that is not functioning and preventing your computer from starting.
Unplug the connecting cable, and plug it back in again, making sure that it is seated properly.
Do you hear any sounds besides the fans? You should be able to hear the faint clicking of a hard drive starting up also. If you hear this, the problem is not in the computer, but in the communication to the monitor.
First of all, most monitors now a days are plug and play. Make sure the monitor is secure on both sides. There is also another connecter like the one attached to the CPU on the monitor, so make sure they're both securly attached. Also make sure you have the connector plugged in the correct monitor port. some computers have 2.
Ensure the video cable is connected (and connected to the correct video port).
Turn off the monitor using the monitor's power button and then restart the monitor.
Cycle the power on the monitor as follows:
Turn off the monitor. The power light on the monitor should be off. Leave the computer turned on.
Unplug the power cord.
Wait 5 seconds.
Plug in the power cord.
Press the power button on the monitor to turn on the monitor.
One of two things happens:
The image from the computer displays on the monitor and you can use the computer again. This indicates that the monitor was unable to detect that the computer had awakened from suspend mode. Turn the monitor off when it is not being used or disable suspend mode. For some computers, updating the BIOS corrects these types of suspend problems.
The power light on the monitor comes on but the screen displays one of the messages again. The monitor is not receiving a video signal from the computer that it can detect and use. Continue using these steps to adjust the Windows display resolution to the Monitor's native (default) resolution
Connect the monitor to another computer that you know is working to determine if the monitor should be serviced or replaced:
If the monitor displays an image from another computer, you know that the monitor works. Troubleshoot the video connection and graphics adapter on the computer.
If the monitor remain blank when connected to another computer, the monitor signal processing hardware may be bad. The monitor should be repaired or replaced.
Motherboard is detecting an error. 1st and most likely to test is power supply to see if it is weak. I did work on one last month of about this model and the bracket for one of the bridge chips broke. You might look inside to see if it's still securely attached. It will be the heat sink below the processor. Keep me posted - Scotty