Try removing the battery (in case it's shorted), plug in the power adapter and boot to bios (using F2, F10, etc). Be sure there are no USB memory sticks connected, etc. If you are able to boot to bios, great! Then, it's a matter of eliminating the root cause: either battery or hard drive. If you don't boot to bios, then you're most likely facing a hardware problem. It may be as simple as an unplugged cable.
If you can't boot to bios, consider connecting an external monitor to rule out LCD display problems.
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