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Can you give us a little more detail, Did it shut itself down and now refuses to power or did it just refuse to power up when you tried to start like normal?
If you do try to power it up do you see any lights or get any beeps or other noises, Does the screen show anything?
Let us know.
first of all could you look at the back of the machine to see if there are any lights on, If there are could you let me know which ones.
If not could you try plugging something else such as a table light into the same outlet as he computer so we can make sure the machine is getting power.
Let me know
Can you tell me where the green light is, Is it next to the power cord?
Could you try unplugging the plug from the wall and then press and hold the power button down for a minimum 30 seconds, release hte power button then reconnect the power and wait another 30seconds then try to power the machine up.
Let me know if anything happens.
Could you unplug everything but the power cord and let me know if the green light remains lit, If so try to power up the machine and let me know what happens.
Also how old is this machine?
As you have tried everything I am suggesting I will opt out and see if another expert can step in and help you.
k i dont know if this has anything to do with the problem but it was showing system resorce low before i shut it down