Dead Computer - Posted In Problem Solving


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Here you can post questions and get answers to help you solve problems with Windows based PC’s

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Dead Computer

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Offline Carl2 Topic starter
United States Posts: 710
Rank: Baron

 I normally use an Asus dual processor computer upgraded to win 8 but am now using a Gateway.  I had a problem lately with win 8 and when I tried to do a repair using the DVD the computer kept running into problems, one after another and would not restart.  The next day when I pressed the power button the computer kept starting, stopping and restarting until I turned the power off.  Since one of my main concerns was the ID's and PW were in notepad on the HD I tried the HD (SSD) in the gateway.  It works in the gateway, using it now, I did have to reactivate it in this machine with Microsoft.  Naturally I disassembled the Asus and found there are 2 connectors to the MB a 4 pin connector and a 24 pin connector, if the 4 pin connector is unplugged the machine keeps running, if it is plugged in the machine keeps restarting.  I opened up the power supply for cleaning and must have shorted it, dead now.  Repair,  upgrade, or buy another.
  Open for suggestions
Carl2
Posted October 13, 2013, 22:40:42 PM Logged

Offline Data
United Kingdom Administrator
Posts: 4624
Rank: Certified

Hi Carl

It sounds to me like the power supply was breaking down, that would explain why it was going wrong when you plugged in the 4 pin lead.

The best thing to do would be to try another power supply. 
Posted October 14, 2013, 01:54:20 AM Logged

Offline Carl2 Topic starter
United States Posts: 710
Rank: Baron

  Seems logical,  worth a try, the original ps is 300 w I can buy a 500w about the same size for about $50 looks like it has the same mb connectors, 4 pins and 24 pins.  The 4 pin connector seems to be saying shut down then restart for some reason, mb or CPU, but worth a try.  I can see a difference in performance with the gateway, wouldn't mind a newer machine at a latter date.  Wish I new more about this stuff.
Thanks
Carl2
Posted October 14, 2013, 03:14:04 AM Logged

Offline Carl2 Topic starter
United States Posts: 710
Rank: Baron

Data,
  I ordered a PS from Newegg, seems to have arrived dead, RMA it back, bought another PS from BestBuy which seems to work.  Testing seems to consist of connecting a green wire on the 24 pin connector to a black wire which should make the fan spin.  With the BestBuy supply the green light on the motherboard lights up but the PS will not turn on when the button on the computer is pressed.  Just connected a hard drive, mouse monitor and keyboard to be sure, same results no PS start up.
Posted October 28, 2013, 13:19:32 PM Logged

Offline Carl2 Topic starter
United States Posts: 710
Rank: Baron

Data,
  Progress, latest development,   checking connections,  I reseated a 4 pin connector on the MB near the cpu and the computer starts and shuts down, restarts.  Basically what the computer had done with the original PS before I killed it.
  Your thought welcome
Carl2
Posted October 28, 2013, 13:34:40 PM Logged

Offline Data
United Kingdom Administrator
Posts: 4624
Rank: Certified

At what point does is shut down, does it get into windows or doesn't it get that far ?

Do you see the BIOS screen ?

Do you hear any beeps ?

Is the CPU fan spinning ?
Posted October 28, 2013, 13:38:42 PM Logged

Offline Snowcrash
England Global Moderator
Posts: 2700
Rank: Certified

I've had similar to this on a LGA1366 motherboard.

First it killed a PSU, worked for a while with new PSU, then motherboard bios was corrupted with no way to re flash that I could work out.
Kept going through power on/ shut down cycle. Didn't even get to graphics on POST, so didn't get anything on screen. Even with everything, (all cards, memory, drives etc) removed except processor.

Try to flash bios to same version, or reset bios if you haven't already. I only cured problem by replacing motherboard.
Posted October 28, 2013, 18:18:13 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Snowcrash
England Global Moderator
Posts: 2700
Rank: Certified

What is the exact make/model of the motherboard? Anything on YouTube?
Posted October 28, 2013, 18:20:01 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Carl2 Topic starter
United States Posts: 710
Rank: Baron

The computer is an Asus, cm5570, Intel core 2 quad.  When the computer starts the pS fan and the cpu fan both run, very brief period of time, before the fan stops spinning it restarts, it has to be shut off with the ps switch.  I learned if I disconnect the four pin connector near the cpu it will continue running and shutdown with a long press of the on off button.
  I can't find anything on the MB, won't hurt to take it out to look at it. 
Carl2
Posted October 28, 2013, 22:46:29 PM Logged

Offline Snowcrash
England Global Moderator
Posts: 2700
Rank: Certified

Exactly the fault I've seen.
It's motherboard BIOS corrupted or power regulator fault.
The only way to prove it is another motherboard.

Fairly sure the 1366 mobo I had a problem with was an ASUS too.
Posted October 28, 2013, 22:59:24 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Snowcrash
England Global Moderator
Posts: 2700
Rank: Certified

I did find this snippet

you should try replacing the cmos battery. i had an asus a8v do the exact same thing when the battery fell out of the motherboard. its possible that batteries are fried and causing some issue with start up.

link.
Posted October 28, 2013, 23:05:33 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Carl2 Topic starter
United States Posts: 710
Rank: Baron

I took everything apart, I'm pretty sure Asus has the motherboard made for them, I think it's an AP006.
I did check that battery it's at about 1 v of the 3 v it should be, change it tomorrow.  I didn't see any lights go on on the keyboard, and nothing on screen.  I did notice once in a while the on time lasted longer then usual.
I contacted Asus bud I didn't get a person in the chat. 
Thanks
Carl2
Posted October 29, 2013, 01:57:18 AM Logged

Offline Data
United Kingdom Administrator
Posts: 4624
Rank: Certified

Them batteries are dead when reading 1Volt, considering the low cost of a new one it must be worth a try.

Good thinking Snowy  thumbsup
Posted October 29, 2013, 13:08:21 PM Logged

Offline Carl2 Topic starter
United States Posts: 710
Rank: Baron

I tried the new battery, still the same problem.  Well I have the case, dvd, hd's and the pwr supply. 
What to do, no hurry.
Carl2
Posted October 29, 2013, 23:08:43 PM Logged

Offline Data
United Kingdom Administrator
Posts: 4624
Rank: Certified

It sounds like a dead motherboard then, you should be able to get one for about $50, I think the board is socket 775 but please double check that, so you would be looking at something like this:

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157359

The only problem I can see is the RAM, these new socket 775 boards seem to take DDR3 but I think you will have DDR2 RAM so you will either need to get a mobo that takes DDR2 or get some DDR3 RAM at the same time.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231425
Posted October 30, 2013, 11:53:01 AM Logged
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