Restart the computer for no reason

Users questions: Computer bought about 5 years, and colleagues bought the same machine, Lenovo. Recently a keyboard, the erratic power screen (black screen), then no black screen of another display test. But in exchange, after the original display, but there was an "undue emphasis from the host" and "black" phenomenon. Machine used Cabas Machine anti-virus package, should not the virus causes colleagues to buy the machine had not been seen this phenomenon can be ruled out is the cause of aging components. I estimate that the hardware's sake, which heroes to know the reason, Please help ~ ~ ~
Experts answer: computer restart error script debugging. Please click on Tools, intere nt options, advanced, find Disable script debugging check mark in the two before. Restart the computer because my computer .. the right health. Property. Senior. Startup and Recovery. Set. The following three hook cancel. Not yet. If you exclude the virus. Is. Power skill small. Bad power supply can not provide enough power Volume increased when the system equipment, power consumption becomes larger, poor quality power supply output voltage will sharply reduce and eventually lead to system instability, the phenomenon appears automatically restart. Voltage fluctuations may also cause excessive damage to the hard disk and other devices. Memory errors cause the system to restart the probability relatively large. Memory and graphics and The case method of poor contact socket .. clean memory and graphics cards with rubber finger .. check CPU fan is working properly .. poor contact socket and air conditioning, refrigerators and other large electrical power line to share a plate inserted. Eventually replaced socket. . Also check whether there is loose inside the chassis.
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