|Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard. |
The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.
The specific model of a brand name system is often shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.
"I tried the power supply, it is well working in another PC board."
Good move. That proves it works fine with another mboard, but there may be one or more reasons it doesn't work with the subject mboard.
What is the make and model of the power supply ?
What is it's max (output) wattage rating ?
If you are using a graphics card installed in a mboard slot for your video, what is the make and model of it, or at least, which specific video chipset does it have ?
If the max (output) wattage rating of the power supply is more than 50 watts less than the minimum capacity recommended for a system with a video card installed with the particular video chipset it has, the power supply may work fine at first, but it's likely it will eventually be damaged by it being overloaded too much of the time when that video card is installed. If the PS has been damaged by that situation, the PS may eventually no longer be able to boot the system when that video card is installed. If your mboard has onboard video (a video adapter built into the mboard), try removing the AC power to the system, remove the video card, connect your monitor to a port for the onboard video, restore AC power, try booting the computer. The PS may still be able to boot the system when you're using that onboard video.
It's extremely RARE for ram that worked fine in the same mboard to go "BAD" , and it's a lot more rare for more than one ram module to go "BAD" at the same time.
Usually there's absolutely nothing wrong with the ram that worked fine previously in the same mboard, UNLESS it's been damaged by some external event, such as by power spikes or surges caused by a power failure event, or by someone having done something they shouldn't have done with the ram, or by someone having NOT removed the AC power to the power supply when plugging in or unplugging anything inside the desktop case AT ALL TIMES.
However, it's common for ram to sometimes develop a poor connection in it's slot over time(s), or for someone to not have seated it properly
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
Sometimes, especially if a ram slot was empty for a long time then had ram installed in it, the slot may have crap in it that needs to be blown out of it (DO NOT use a vaccuum cleaner to do that).
One of the LEAST likely things is the CPU has failed
Failing power supplies are common.
If you eliminate the power supply as the cause of your problem, and if cleaning off the contacts and re-seating the ram that worked fine previously didn't help, probably the most common reason for the system not working is something on the mboard has become defective or has been damaged.
Rarely, especially if you have a NVidia main chipset, one of the chips in the main chipset may have become defective over time.
Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.
Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .
What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.: