Have the same green light inside but turning it on with the power button nothing comes on is it the power button?
Check that the switch on the power supply has not been accidentally bumped.
It should be on the - side... not the o side.
There could be a variety of other problems including the power switch.
Possible reasons a PC will not power up:
Failed Power Button.
Power strip breaker tripped - are there other items plugged in that work?
Failed memory Module.
Failed CPU.
Failed CPU Cooling fan.
Failed power supply.
You will need to test each item with a Digital Multi Meter (DMM) and verify 12VDC at each item. CPU and Memory can only be tested externally by a shop with a reader.
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