Computer was up and running fine for a couple of weeks and then crashed. was completely non responsive and had shut down manually. When turned back on it does absolutely nothing, I can't start in safe mode, access start up utility, or bios. No signal is being sent to the monitor at all. Help!
1. When you switch on the supply, and press the power button on, do you see any LED activity - thus indicating power may be running to the board? If not, it could point to a possible supply failure, and so you should check the internal fuse at the rear of the supply.
2. Do you have more than one memory module? If so, try running the computer with only one memory module at a time, thus eliminating the possibility of a single RAM module failing the entire system.
3. Is the CPU seated correctly, could it have become dislodged from its mountings? Heatsink fans (HSF's) are quite heavy, and when they force a cpu to become disconnected, you would not be able to boot in that case too.
Be sure to consider ESD protection when inside your computer, and at the very least, ground your body by touching with both hands a gas pipe, etc, that is connected to ground, before handling any memory / cpu parts.
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As you may already know, your computer will shut down after power on if if the power supply does not receive a power good signal from the motherboard. Since you already tested the PSU in another computer, and you know the PSU is good, either you have a bad mobo or some device connected to the power supply is draining excessive power from the PSU and causing it to shut down.
Try removing the 4 pin pin power plugs from ALL devices, such as the floppy drive, CD drives etc.
If the system stays on when you power up, then you can isolate the faulty device by re-connecting them one-by-one. If the system still shuts down your Mobo or CPU is bad and you might want to take it to a PC technician to determine if it's worth fixing.
If you have any additional questions contact me by clicking on the "Add a comment" link located under your problem description on FixYa. Also, if you believe that this information was helpful to you, please return to the FixYa website and rate my response to your question.
The capacitors on the motherboard have aged and they aren't capable no more of filtering the current to the processor. Either you replace them, good soldering skills are needed for that, or just replace it entirely.
this is a problem complexing situation because here are involved more than one device that causing this, if you have time and parts to experiment is a good think, you have to take out from your board cpu ram and vga-s and put in their place a second component(take from your friend or if you know that guy in service maybe halping you with parts so even him is taking experience of this situations). after testing your Mb with second components if it working fine no shut downs no crahes, then problem is in one of other components, try it taking out second parts one by one eny time, replacing with your components. begin with vga(or vga-s if you have more than one but is better to put it and prove them one by one to diagnose if their have problems) after doing this and you didnt finded problem in vga/s let your part in place and change second ram taht you puted with yours(if have more than a module prove it one by one each time reboting system after each one.) if even in your ram you dont have problems, so change cpu/s. one of this components without dubt is faulty.
if problem resolved and you dont have more problems and didnt find a faulty component and your pc is working fine so it was a miss making.
try all experiments with mother board outside case. some time shrt circuit of Mb with case is causing problem, after try it in case if you dont finded problems, in any way that i told you up.