Acer Aspire M3600 which wont boot

Hi Guys,
My parents acer aspire m3600 has stopped booting up normally. Sometimes I would have to keep hold of the power button to turn it on, as I hold the button it follows a cycle of flicking the aspire led light with the networking light. As it starts to turn on, the aspire led light starts to flicker faster and faster then the computer will 'miraculously' turn on or it will boot but there will be no signal to the monitor but the desktop will act normally

Please help me guys, Im bgging you because my warranty is finished loooool
 
Are you sure because each time I press the switch to turn on my computer even though the blue led "aspire" light flickers on and off, the fan moves when it flickers
 
Yes... or bad motherboard. Power supplies are easier and cheaper to replace than motherboards are:D
 
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