computer gets switched off within few seconds of start

Question

The computer wont start properly for first 5-6 times when i start. it turns off in few second, after 5-6 attempts it works normal without any error. It usually happens when i start the system after 4-5 hour gap. y system has M2N Mx motherboard with AMD 3800+ chip, 3 GB RAM, 1 500GB HDD, 1 160GB HDD, NVIDIA Geforce 8400GS Graphic 512MB graphic board it all runs on 450 watt power supply

Answer 1

I had similar issue with faulty power button. It would get stuck (contact always on) and BIOS would power computer off after 4 seconds. After pressing it few times, it would get unstuck for some time. Few more presses and it would get stuck again.

Easiest way to check this is to press button and then immediately disconnect it from motherboard (just two wires). If it works in that case, it is button. Otherwise, it is something related to cold.

Answer 2

There are many possibilities for such a problem. We can cite them all here, but will you replace so many parts in your computer for doubtful results?

Rather than randomly changing parts, it is advisable to take the computer to a repairman that has the tools to analyze the problem. That way you will just pay for one faulty part.

Answer 3

In addition if all other things are fine, the temperature sensor could be faulty. This has happened to me before and even though temperatures are fine, comp shuts down thinking it is too hot/cold

Answer 4

Disconnect everything you don't need to do a basic power up, e.g. HDDs, DVD/CDs and then see if it will power up first time. It may be your PSU is dying.

Answer 5

It could be that the PC is too cold. What kind of a colling system do you have?

Answer 6

This may be one of the reasons:

• The cpu fan may have stopped working. The function of the fan is to keep the cpu in an ideal temperature, and since that doesn't happen, the cpu gets over heated and in order to prevent any damage, the computer shuts down.