RTFM

How do you get it to come back on?

http://cr4.globalspec.com/thread/78741

Check your power management settings. Maybe it is the 10 minutes screen off function.

Pay the electricity bill.

What do you mean by "goes off". In English, there are many connotations of that term that have different meanings. A better description should yield a better or more appropriate answer. Do you mean that the screen just goes black and it suddenly starts to reboot?

Do you have a good power connection? At one time, I had the same kind of symptom, only to find that I was stepping on the power cord and causing it to nearly pull out of the plug. After I moved the cord, I had no further problem. It really could be that simple.

The problem appears solved after computer technician recently did some repair in the CPU (replaced burnt portion in one wire termination). He observed there were repeated overvoltage problems in the supply line.

However,the problem may repeat,if there is overvoltage again in the Utility line.

It sounds like you need to investigate the cause of the overvoltages. The PC power supply may be shutting down if it is hammered with high voltages.

In areas where the power feed is single phase (non industrial settings) the power is usually fed from a secondary that has a center tap as neutral. The two end taps provider a higher voltage for certain appliances that use a lot of power and everything else is fed from one end to the center tap or the other end to the center tap. Generally the load is shared or split so that the power transformer does not overheat one end of its (secondary) output coil.

A frequent cause of overvoltage occurs when this connection to the center tap becomes loose or worn. In that case, higher voltage is across all loads and the neutral moves up and down in voltage with the load. That also causes your lighting to dim and brighten. Other forms of overvoltage are generally much faster and the lights may appear to brighten as if someone took a flash picture. It helps to know what kind of overvoltage you are experiencing.

Thank you for the advice.I will investigate further on overvoltage.