|Did this apply intially??:|
"If this system was working fine previously and you have NOT been fiddling with connections inside the case and have NOT changed which ram is installed in it since it last worked...."
Did you try this:
See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
If you have tried or examined EVERYTHING I have mentioned above......
Is there a possibilty this computer was exposed to
- a nearby lightning strike?
- a static electricity discharge, such as if it's in a location with synthetic wall to wall carpet and the humidity is low there?
Sometimes a defective drive can cause strange problems, especially if it's logic board has failed - .
Try unplugging all drives, with the AC power to the case removed - and then trying to boot
If you have a floppy drive and when it's hooked up, does the led for it light up, AFTER the usual brief flash you usually see while booting when there's no floppy in it, for a while, then go out?
If the led is on all the time after attempting to boot, one end of the data cable is installed backwards - that can cause booting problems.
Have you ever had a PCI-E X16 video card installed, or other cards installed in slots, on this mboard?
Try removing the mboard battery for a few minutes, with the AC power to the case removed, re-installing it.
If it then boots, you will have to set the date and time in the bios Setup
Did you move the clear cmos jumper?
If you did, did you place it back on the pins for "normal" - the mboard may not boot if that isn't on the proper pins, or if you removed it and didn't put it back on.
Alternately, you could try moving the clear cmos jumper with the AC power to the case removed, moving it back, but you may need to consult the mboard manual regarding that - the markingson the mboard can be confusing.
If none of the above helped, you have truly done and checked everything, if it doesn't pass this test it's probably dead.
Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.
In most cases, there's nothing wrong with any of the other components, and replacing the mboard with one that can use the same pieces yields you a working system.