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The greenlight is probably the UPS [Uninterruptible Power Source]. If the computer was shut down by a normal windows shutdown and the UPS remained plugged into the 120 Volt line and the computer's power supply plugged into the UPS and the UPS NOT turned off, there would still be 5 volt standby voltage applied to the computer's motherboard. ATX type computers never go completely off unless the power supply is turned off or unplugged. That 5 volts would have to on steadily for the rest of the voltages from the supply to turn on. If there is a reset button or on off switch at the back where your power cord plugs in toggle it back and forth. You can also try disconnecting the power supply and holding the power button in for about 15 seconds to discharge power.Leave it unplugged for a few minutes. Then try powering it back up again. If those don't work then you might have a bad power supply. They are not hard to replace.
Hope it helps
there are two posibilities...
1 ur power supply is out, to check if ur power supply is OK, check if fan on power supply is running when u switch on the PC, if it works then that's OK
2 - ur motherboard is out, if this is the case ur CPU fan will not work but ur power supply fan will work
I suspect the power supply for the monitor. Try a power supply from a working monitor. If you have a used computer store nearby, take your power supply to them and try it on another monitor.
There is no need to turn off a monitor using its power switch. Monitors automatically go into standby mode when they are not receiving a signal. In standby mode they use less than one cent of electricity per day. If saving electricity is your goal, raise the temperature in your home by a degree and run the air conditioning less.
If the computer shuts down with no warning then it could be your power supply is faulty, which explains it not turning on sometimes. Just check the back of the PC to make sure it is plugged in properly (TURN OFF ALL POWER TO THE PC BEFORE CHECKING). if this does not help, get it looked at by your local qualified computer technician if you don't know how to replace a power supply. Also, a connection to the motherboard to the Power button may have a fault somewhere, which also means take it in for a look if you don't know what to do. If it does give you warning with 'Windows is shutting down' it can be the following things. 1- Your power button on the PC is sticky and movement causes the computer to think you have pressed it and so it shuts down, which can also explain why it wont turn on all the time. Just use some household grease cutter and spray it on the outside of the button, turn off the power supply to th computer and press it in and out a few times to get it back to working order 2- A Virus is shutting your computer down on you, but this does not fully explain why it won't turn on but this could be an effect of the virus so use a virus checker to see if this is the case 3- Your computer system is getting too hot and usually a computer has setting which shuts it down before permanent damage happens. Check your PC fans to make sure they are running and feel around where your computer sits to see if its warm or hot and replace the fans or put your PC in a cooler environment