Check the CPU is undamaged and seated properly and check you havent disturbed your memory, it's easy to do if the cpu fastener is close to the memory. Remove and re-insert the parts if you feel they may have been disturbed. Same with graphics card, the system won't boot unless it has a graphics card installed. If all else fails then reset your BIOS by either removing the battery for a few mins or using the BIOS clear jumper.
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