My HP desktop monitor will come one with a green light, and 1 or 2 seconds later it turns yellow and goes off, nothing seems to keep my monitor on, I have tried everything, why do you think the monitor does not stay on?
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.
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It should make one beep. That means it passed the self-test. If there is nothing on the monitor (is the monitor light green or yellow?) then the monitor is bad. I suggest you try another monitor to be sure. Borrow one from a friend.
turn on monitor first then the hp if all is well just remember sequance if not then check cable to monitor from hp if it can be replaced then replace cable but check hp with another monitor first just incase the monitor is gone.
do you have an aftermarket video card. In the bios you have to tell the computer if it is looking for a agp/onboard or PCI video card. Either that or the video driver or settings are wrong Try safe mode to check
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