During booting time your CPU fan is moving for sometime and also stops and starts and stops nothing is coming. Monitor shows a red light so what has happened and what is the solution?

Answer 1

If your CPU fan starts and stops, and the monitor's activity light stays red or amber when it is usually supposed to be green, that would likely be the motherboard. You could try a few things to try to rule out the motherboard.

1. You could swap out the memory or reduce the amount used and try different combinations, to rule out the memory.

2. You can try removing any peripheral cards that are not necessary to get the machine to come up. If it works after removing something, then you could have a bad card, or in some cases, the power supply is starting to show signs of failure.

3. You could try a different power supply just in case, but since the fans run, this is not likely. Do check to see if your power supply is set to the correct line voltage. Make sure it is unplugged if you must change the setting. If you are in the US and have it set to 230 volts, the machine won't work properly.

4. You could try a different CPU chip. However, there is a word of warning here. If the heat sink compound is hard, the CPU might be glued to the heat sink. So it is possible that the CPU will get pulled out with the release lever down, and if that happens, you will have bent pins. You might be able to fix that, but it is tedious, and then you'd likely still have your original problem.

5. You could try a different video card, or an additional one if there is none to remove.

6. Check to see if the motherboard has visible signs of damage or an odd odor besides the expected circuit board smell. Check for bulging, exploded, or leaking capacitors. Electrolytic capacitors look like tiny cans standing up on the board with labels on them and aluminum on top. Check also for burned or cracked ICs, signs of corrosion on metal parts, dead or living cockroaches, dissolved or burned traces, and insect or rodent droppings. If you find such signs, they are a good indication that your motherboard is defective.

If none of the above change the behavior favorably, especially if you find the signs of wear noted in item #6, then it will be fairly safe to assume the motherboard is the problem. Otherwise, you'd replace what you discover causes it to work.