The power on my desktop comes on but not my monitor

try and boot in safe mode and check the frequency, it should be 60 htz if nothing it's possible your video card has gone out, do you have a second monitor to test?

If you need further help, reach me via phone at https://www.6ya.com/expert/joel_63c670a84e9f6a97

There is your answer no power to the monitor. Make sure it is plugged in replace with another monitor if you cannot get the button on the monitor to power on the unit. Maybe time for another monitor. John

Hi
Is the desktop on?
Open it up and check the on-board light.Is it on?
Are the fans running?
Check the hard disk connections.
Is the monitor powered?
Try replacing the VGA cable.

Remove the video card and connect the monitor to the onboard VGA. If the problem continues, check the power supply. If you have another with the same wattage rating, see if it works ok - it might be the power supply going out.

1. This is possibly due to a malfunctioning power supply if the monitor works on another PC then the summation is the power supply is not giving the +5/-5 -12/+12 volts to the mother board to power the video card and other peripherals.
2. Your power supply will need to be replaced.
I hoped this helps. Have a Great Day!

you prolly need a new video card.

Here is some diagnostic information. The Fans running at full speed are an indication of a NO POST failure
http://www.fixya.com/support/r4282412-find_no_post_diagnostic_information_dell

The first thing i'd do, is open the cabinet, remove the memory and detached all the peripheral card, then replace everything and retry. Common problems can come from peripheral card sliding out of their ''tray''. This can happen because when we connect stuff behind the computer (monitor and acc.) can moved those card. Of course it could be many other things, but thats where i always start a troubleshoot...
Let me know!

Try running a penny across the monitor's cable pins while powered on. If you contact a certain pin with the penny and the monitor exits sleep mode, your monitor is fine. If not, buy another one.

Actually, the monitor is fine. The problem is that the computer isn't booting. The power comes on and the fans spin, but the system board isn't starting. Try reseating the memory modules in their sockets and clearing the CMOS memory using the jumper on the system board. If the problem continues, try another power supply. Finally you may need to replace the system board.