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Posted 09 March 2014 - 07:23 PM
Posted 10 March 2014 - 08:53 AM
You need that 4 pin power to the main board for the board to operate correctly. If it does not work with that 4 pin plugged in, you might try a different power supply. There are many things that can cause a post fault. Is there a speaker plugged into the main board? Does it give any beep code? Remove all non essential components: PCI cards, add in video, etc (if you have onboard video use this).You may have a bad stick of ram or bad slot. If there are no beep codes and the computer is powering on, I would recommend trying 1 stick of ram in 1 slot at a time. Move the stick to each slot on the main board. If you still have nothing, try a different stick in all of the slots.
You should try with both the 4 pin and 20/24pin power plugged into the main board. You do not need anything else connected power related for the computer to post.
Also some things to look for while you are looking in the case are bulging or blown capacitors examples here: https://www.google.com/search?q=motherboard+bulging+blown+capacitors&source=lnms&tbm=isch&sa=X&ei=6sMdU4OYNMuJqQH40YD4BQ&ved=0CAgQ_AUoAg&biw=855&bih=461
If you have any blown or bulging capacitors I recommend replacing the computer, they often cause intermittent problems and eventually lead to complete failure.
Edited by zingo156, 10 March 2014 - 08:56 AM.
Posted 10 March 2014 - 04:58 PM
Thanks for the help. I tried everything you mentioned and no luck.
Caps look good , no swelling or bursting.
Took my Emu 1212M sound card (which is 2 cards btw) out of the expansion slot
Removed ram, put ram back in 1 at a time, different slot each time.
No beeps. It will rev up and the led behind the power button will flash if I hold the power button but if I let go it just dies.
And, the green led on the back from the psu is solid green.
I can order a new psu for about $50 but how do I know it's not the motherboard.
Edited by Scottronic, 10 March 2014 - 04:58 PM.
Posted 11 March 2014 - 07:36 AM
Unfortunately if you can not get it to power on and the bios does not report any beep codes, it is down to replacing parts one at a time. Power supplies are some of the most common failure points in computers, I would say about equal with hard drives in the retail world. The PSU would be the first thing I would try. With the age of the machine it is hard to recommend throwing money at it though. You might be able to get a used power supply from a local tech shop, they might let you return it if it does not fix the issue.
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