1st try a known good AC adapter, see if any change. 2nd, remove all drives, battery, external devices, RAM and wireless cards and see if system powers on and gives memory beep code error. If no change, replace motherboard. If you get beeps, power off, install a RAM module, see if system posts. If it does, add items till you identify the failed component. If no go, replace motherboard. Motherboards are roughly $150 on EBay
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