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Hints are1- Power Supply2- Power Cable3- Motherboard4- Processor5- Rams6- Hard disk7- Fans8- Heat sink
Of the most important reasons that lead to the closure device directly after batch - The hottest processor with a high degree, the lack of sufficient cooling. - Defect in RAM installed. - BIOS.
There are many reasons regarding your question like
1- BIOS.
2- RAM.
3- Processor Heated.
and there are some computer hardware have cover sensor may be the cover not well closed.