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I broke my laptop by banging its keyboard. It now won't start and only shows a black screen. It shows the LED lights that it's connected to the battery adapter and that it's turned on, but won't do anything else. I removed the hard drive and it tested OK in another laptop.

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If its still under warranty I'd send it in. Opening it up can void your warranty depending on the vendor. – John T Jan 21 '11 at 2:26
+1 for admitting to "banging its keyboard" and breaking it. – Moab Jan 21 '11 at 4:05

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Does it make any beeps when you turn it on? Does an external monitor show anything when connected?

If answers to both of those is no, you probably have a dead mainboard. Very unlikely to be worthwhile to try and fix.

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