Check your RAM memory. Very often bad memory will cause the video to stop working. If you have more than one stick of memory try removing one of them or all but one if you have more than two. Be sure to power off your computer first and then remove the power cord from the power supply. There is usually still some power going to the motherboard even though it has been turned off. This will protect against damaging your memory while taking it out or putting it back in. Power on your machine and see if there is any change. If not, go through the steps above again and swap the first stick of memory with one of the ones you removed earlier. If there is still not any change then at least you know that it is not the memory causing the problem. (You must have at least one stick of memory in the computer for it to boot.) The next thing you might try is to swap out your video card with one that you know is working. If that does not help I would move next to the power supply. If you have a lot of devices installed in your computer (multiple CD/DVD drives, multiple hard drives, several USB powered devices, high-end video card(s), etc) you may be reaching the limits of your power supply capacity or your power supply may be going bad. It is possible for a machine to power on but not have enough power to run all of your devices.
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Substituting in other working components will be the only way to confirm the motherboard is not working. You may find that the motherboard or the CPU has died. Without more information about your system, it is difficult to provide more help.
must be the pulse width modulator (PWM) circuits that control the fan, I'm afraid there's nothing you can do with that unless you work for the manufacturer, but you can get converters so that you can hook the fans up to the power supply, this should be a good fix until you get a new board!
you semm have replaced any component in your motherboard eccept two, monitor and motherboard itself. try to put your new component in similar mother board begining with cpu ram vga, and put in output in same monitor (you must be hure that second motherboard is working) if nothing is coming try second monitor for output, if nothing is coming and have maybe beeps, one of your component that you have puted is defektive so try to replace them one by one. is not necesary to buy new component just try in other friend eith his parts afterthat if you finded defekyive component replace it in *********** board, (or if *********** board is defektive you must replace him, or monitor too if the problem is in monitor)
if you have onboard video try a video card that fits in PCI or AGP slot or try a different video card in place of the one you use with everything else seeming to be correct this seems like the only thing you have not done
1. Processor is cold dead.
2. Power Supply has got a problem. Just powering a fan is not a guarantee that it is powering everything normaly. Try a different one as you test agai.
3. I suspect your MoBo is good, but try a different video card also with your new DDR.
4. Do you hear the HDD cranking or whining when you turn on the PC? Keep ear near HDD and listen. It it whine-starts, it's a fair sign.
5. Try a different monitor while you test these.
I've seen situations similar to yours several times and they've always been a bad CPU. Since you tried a new video card it's not that, I would suggest a new CPU. Check on ebay, you can usually find used one's on there.
It looks like your mother board is old one. If so clean it with IPA solution (Iso propyl alcohol). Replace the processor.Then try again.
You can also try changing your Video card. That can cause problems if not seated properly.
If nothing works get your motherboard serviced.