Hi mate, try removing all power sources, i.e. main power lead, main battery, bios battery, then press the power button for about 10 seconds to remove any residual charge on the motherboard. Apologies if you have already done this. If not update and flash to new bios... download here for your OS...
http://support.acer-euro.com/drivers/notebook/as_4710.html
Cheers
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