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The first thing to check is the cable between the tower and the monitor. If you have done this, then hold the power button until the computer shuts off...wait 5 seconds and then turn it back on. If these two things do not work, then it is likely that the integrated video part of the mother board has failed.
I would try shutting down the computer in the normal way, and turning off the monitor. Boot up and turn the monitor back on. If it still doesn't work, then I would check the cables and power plugs and wall plugs. Check the mouse and keyboard cable and any other cables plugged into the computer. The next step requires a seperate monitor or laptop. Try unplugging the monitor and pluging in another monitor. Most laptops have a common VGA adaptor jack or even an Svideo jack. If the other monitor does not work, Then take to a qualified technician for repair. It could be your power supply in the computer or video controller.
I hope this was useful and please comment if this was helpful to you.
If I were you I would just press and hold the power button on your computer tower until it shut's off and then turn the computer back on. I assume that since you were shutting it down that you had nothing important open, so forcing it to shut down won't hurt anything.
Hi, If the computer is hot near the electrical plug in the back of the computer then the power supply needs to be replaced. This will also cause overheating problems if the fan does not exhaust enough air. You should not run the computer in this condition because the power supply can short out and take other components with it. Also there is a risk that it will burn up. Power supplies are very inexpensive and can be changed by anyone with basic computer repair knowledge. Hank
Try holding down the power for a full minute or two then start it up again. The power button may be set for sleep and not shut down. You may have to hold the button longer. If that doesn't work it could be RAM, or a serious problem with the motherboard.
You may need to replace the cmos battery, its a cr2032 3v button cell Make sure all your expansion cards and memory are reseated. Make sure all cables are reseated. your power supply could be bad
If that doesn't work try this
Here is my fix for the dell dimension 4400 amber light problem. It works! replace cmos battery. then unplug power cord form wall about 5-10 secs. then plug it back in, wait 5 secs. If amber light comes on, press and hold power button until it goes out.
light out, press and hold power button while amber light comes on and
goes off again holding power button 2-3 secs after light goes out.)
repeat whats in parenthesis until computer turns on it should only take about 6, 7 tries.
After the computer boots, you may want to setup cmos or boot into windows. After you shutdown, unplug power cord for 5-10 secs then plug it back in. Press and hold the power button, computer should come on. I found that's the only way to turn on the computer. If you shutdown and don't unplug power cord the computer may not boot, mine didn't. Strange I'd say
I would test the memory. Also I think some computers will shut down if the fan on top of the CPU quits working. Or maybe one of the other fans or the Hard Drive quit and is drawing too much juice causing the PSU to shut down. It sounds like something may be grounding.