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Help! May have killed two computers.. Repetitive Beep of Death

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Fist off, general comp specs relevant:
HD: 320gb seagate (16mb)
AMD AM2 Athlong 64x2 dual core 6000 3ghz
2x DDR2 2gb corsair pc5300
Video card 8800GTS 320mb

My computer: When I turned the power on would not start and would not make any POST beeps. I tried removing the video card / RAM / checking all plugs were in properly.. nothing worked. I swapped some RAM into my computer from my brothers.. still didn't work - so I tried his HD (same model, 320gb Seagate) in mine.. and it started to make POST beeps, long and repetitive. I hooked my HD back up and it made the same noises.

Now before I touched my brothers computer, it was working perfect. The only parts I removed was the HD and the RAM. Now I ordered a new HD and new RAM - hooked them both up and his computer STILL makes the long continuous beeps.

Is it possible I killed his RAM / HD and that somehow killed something else??

I'm reluctant to keep fiddling around in case I cause more damage. I'd prefer to fix it myself as I'm now living in a more rural area and a) don't trust computer techs around here and b) they would probably take weeks to work the problem out and charge me more than the cost of a new comp

I've read an extensive list of FAQ's and thought that on my computer, the power supply was faulty and killed my HD / possibly my RAM as well. I'm having difficulty hooking up my new power supply on my computer so I can't be sure that was the problem or not.

I'm pretty desperate for advice, I've read so many FAQ's I'm just confused now - and would really like to try to fix my brothers computer.. before he is back from overseas :) lol
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OK, first of all, forget the hard drives. Unless they are shorted and killing your power, they cannot cause a post problem.
So, first of all, disconnect the wires to the drives. You do not need them to boot the machine.
The machine will almost certainly not boot after that, but try anyway. If it boots to the point where it says no operating system found, then something on the drive is sucking down your power supply. Not likely though.
The beep codes are different depending on which BIOS you have, so its hard to diagnose without knowing that. But in most cases, long beeps are ram problems. You need to try to use ram you know is correct. The new ram may not be.
Odds are, you are not putting the ram in right, or you have a socket problem. Some motherboards are sensitive as to which sockets you use. Try to find out how the motherboard maker says to install the chips.
Also, you mentioned the video card. They are known for seeming to be plugged in all the way when they are not. Make darn sure that it is in all the way. Try reseating it.
If none of that works, get a good light and a magnifying glass and look close at the ram socket pins. I have seen them get bent before.
Also, look for other stuff like something sitting on the keyboard holding a key down. Heck, try swapping the keyboard or leaving it unplugged to see if that changes anything.
But forget the hard drive. Just leave it unhooked until you get the machine to POST.
If the machine started to beep when you installed the drive, odds are it is something you did while installing it. You moved a connection, dropped a screw, etc. Because a hard drive should not cause a POST problem.

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Good news! Fixed my brothers computer... the RAM had been fried and the new RAM mustn't have been seated correctly. Thanks for the guide.

Bad news is my computer - with a new PSU / case - is still not posting. I've tried reseating RAM, unplugging all devices except MB / cpu.. I'm starting to think my MB died too.

I'm a little confused at how to reset the CMOS however - I've read you can short the CMOS.. but I don't know how. Do I take the battery out and start the comp? Do I just link the 2 pins with a screwdriver? It's all a bit confusing and what one person suggests, another person says definitely don't do that!
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Disconnect everything from the Motherboard except

* keyboard
* mouse
* video output
* 20+4 powercable
* 4/8 pin 12v wire both coming from the powersupply,
* Cpu fan wire
* power and reset button to the case
*case speaker

Now you should have NOTHING connected to the motherboard except what was listed above.

The goal here is just to test the mobo:

If the computer still will not boot up the please remove the motherboard from the computer along with the power supply

place the motherboard on a piece of card board larger than the motherboard,

this will eliminate a short from the mobo to the case witch could be a possibility

Install the cpu with, 1 stick ram in dimm 1, power supply, case switch and case speaker
Connect ps2 mouse and keyboard along with the monitor
Repeat the above and power on

If the computer now boots into bios you most likely had a case short so make sure when installing the motherboard in the case that you use standoffs and they line up with the mounting holes in the motherboard and none of the standoffs touch anything else on the underside of the board.
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