Help on a compaq desktop pc

try a video card

It sounds like the power supply is defective and will need to be replaced.
I hope this helped.
Good luck and have a great day.

PLS REMOVE THE POWER CORD AND THE BATTERY FROM YOUR LAPTOP AND WAIT FOR 5 MINS THEN RE-INSERT THEM AND ON IT . SHOULD WORK

. PLS REPLY OR COMMENT. THANKS

you computer is infected with a virus . restart your system..press F8 key while restarting..select option SAFE MODE...when the PC starts in safe mode...scan your system with any good antivirus

Switch off and reboot.

check your connections to the monitor and pc make sure all your connections are secure. It could be a bad video card in the pc, bad cable or bad monitor.

Probably your power supply. They are pretty cheap to replace. If it's plugged into a power bar then try plugging it directly into a wall socket just to make sure it isn't your power supply.

Try this troubleshooting guide it has worked for me in the past 99% of the time http://arstechnica.com/guides/tweaks/troubleshooting.ars

dont u dare ever use 220 line on thes eon usa power u blow it ever time u turn it on at 220 v dont u dare do that not no reset switch erther u must now buy new power supllly ok

Hello,
For solving your problem do the following:
1. Check that the power cable is connected properly to the monitor
2. See that the SMPS of the CPU is working
3. Check that the power output from the SMPS is upot 12V

If not change the SMPS it may be due to failure of SMPS.

Let me know if your problem is solved and rate me as FIXYA!