Hi everyone,
I got a problem with my P4 3gh PC. Some time it boots normally and some time not. Like when i turn on the power button nothing happen, not  post sound. I changed to 3gig ram, 512 video card, SB Audiology 2 sound card ,but same problem appears. Do you think it is motherboard problem?
Thanks.
Hi there,
It is most probably a problem with your motherboard’s BIOS chip or some power phase capacitors. As you’ve said there is no POST sound when it does not start up, it means that the BIOS chip is not functioning. Also, it may be a problem with the data in EEPROM, which can be solved by clearing your CMOS data.
Try removing the CMOS battery and clearing the CMOS using the CLRTC Jumper. As you’ve said, it sometimes start up correctly, it also indicates the problem may be in the power system of your motherboard. Motherboards contain capacitors which filters current going to various parts of it. Damaged capacitors could cause power to stop reaching some parts at some times, causing malfunctions, unusual errors or sometimes, no POST. The best solution is to change the motherboard or to send it for warranty repair.
You can look into following pages containing similar problem, to see if something helps.
Check the power supply for your PC is the power supply working perfectly or not. You have to locate your problem it may not be a problem in your motherboard. Lets try it here first check you power cable of your PC is it is plugged tidily in the board. And does not have any kind of problem. Then it comes to your PC if you can open the case then do it and check step by step all things are connected properly or they need to be configured.
If you found any loose connection then make it correct. Check the any thing is not out of order over all. Specially check the switch and its wires coming out of the motherboard. If this all is well then may be its a problem of some hardware so check some boot devices on your PC and I am sure it will configure you PC.
