I have an old Acer Aspire 7560 laptop that I don't want to part with just yet. When it wouldn't turn on or boot up, I figured the problem was with the battery, power supply, or processor. A new quad-core laptop will cost me an arm and a leg, but batteries and adapters are cheap and easy, so I started with that instead. The parts are less than $50 and my rig is working again. The lesson here is: don't throw away your old electronics, folks. Invest a little time and energy in maintaining them and you'll give them a long life... and save a lot of money.
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