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try this shut down computer unplug the power supply open the tower remove the cmos battery if you don't know how the battery looks just look for a one similar to a cel battery like the ones that are use for watches only bigger. Then plug your compu back on turned on never mind the message you get after that again turned off unplug the power supply again put back the battery make sure the letters and numbers are facing you plugged back turned on if work you will need to reset your date and time again.
Make sure the power is being supplied from a working source, then check if the switch on the bottom-back of the computer is switched on. If the power button still doesn't work, try holding the button down for 10 seconds. Next, try switching the switch off, unplugging the computer for at least 30 seconds, plugging it back in, switching the switch back on, and pressing the button.
Remove the power cord.
Locate the 120V / 240 V ac selector switch. (within 4 inch from the power inlet)
Move it back and forth few time.
Make use it's set to the correct voltage selection.
Reconnect power cord and power up.
This AC selector switch can get shifted and set to different position.
I love this one. I've actually done this many times before and have been successful.
1. Turn the computer off and unplug the power cord from the back of the tower.
2. Press and hold the power button for about 3 seconds while the computer is unplugged (this drains the remaining power from the capacitors on the motherboard).
3. Plug the computer back in and turn it on.
If that does not work, follow steps 1 and 2 again, but this time:
3. Open the computer while it is unplugged and unplug the power supply from the motherboard then hold down the power button again for 3 seconds. (You may also want to take the RAM out and put in back in)
4. Plug everything back in and turn the computer on.
1. Remove all the connection at the back of your computer 2. Power cycle your computer tower by pressing the power button for 15 seconds 3.
Plug the power cord back in and monitor cable at the back of your
computer tower (if it turned on, meaning that one of the device plugged
at the back of your computer is the one's causing the problem, for you
to pin point the problem, try plugging it one-by-one and turn on the
computer each time you plug a device) 4. If it keeps on doing that,
open up your computer tower (be careful to unplug the power cord and
power cycle it to avoid static electricity) 5. Reseat the video card, turn on the computer again, if it's still occurring 6.
Reseat the IDE/Sata cable of your hard drive and try to make sure it's
properly plugged in, turn on the computer again, if it's still occurring 7. Reseat the memory, turn on the computer and test it again if the same thing 8.
If you have 2 memory chip inserted in your computer tower memory slot,
remove the other one and turn on the computer, do the same thing to
other memory and each slot 9. Reseat the CPU and start the computer.
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