1, the memory may be loose or the memory itself has a problem, reinsert the memory or change the root memory to try.
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2. The mainboard power supply chip is welded or aging, the screen line is loose or the mainboard power supply circuit to the screen is short circuit.
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3, video card, south bridge, North bridge BGA package chip welding or damage, through professional BGA package welding equipment and technology welding or replacement solution.
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4, the machine moisture shock or long-term overheating will lead to this situation, if you have disassembly experience, you can disassemble the machine to detect whether the internal parts are loose or the interface falls off.