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288 posts

Ultimate Geek
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Topic # 24992 8-Aug-2008 20:07
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Vista 32 bit
AMD 4200 *2
Asus M2N4-SLI

Had this pc about 15 months. The ethernet port was playing up. IThe port would turn off thus I would lose inernet access. This seems to have happened after a vista update. I loaded in Nvidia drivers and it continued to happen. I decided to put a new PCI ethernet card. Upon reboot as the title states the pc starts to boot and shuts down after 3 seconds. I have removed the new card and all other cards. I have tested the PSU with a voltage checker. I have tested the power button. All those mentioned are in working order. The PSU puts outs the correct voltage.

You cannot switch the pc on from the power on button at the front of the case, only from the PSU switch. The fans all start and I here the hard disk tick over then shut down every time.

3 seconds is not enough time to get any VGA output so I cant see any bios loading.

Any input would be great. If anyone else has had this issue, I would love to hear from you.


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411 posts

Ultimate Geek

  Reply # 155315 8-Aug-2008 20:19
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I had a pc that when I put a wireless adapter in it it did a similar thing to this.

The issue was that the bios could not handle the driver for it, to get rid of the driver I just restored the computer.

Seeing as the computer restarts at that stage, maybe try unplugging the hdd, and see if it will boot to the bios screen maybe?

bit far fetched, but would let you know.

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Uber Geek
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Reply # 155317 8-Aug-2008 20:22
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It could be CPU temperature - I had something happening on a box with bad temperature control and solved by changing the CPU fan. But you would hear the beeps.

There isn't such a thing as "BIOS and drivers". The drivers are loaded by the OS and three seconds is not long enough to even start loading the OS so I don't think it's the problem.

It could be memory, but it's hard to test without being able to boot.

Take it to a repair shop I say.


288 posts

Ultimate Geek
+1 received by user: 25


  Reply # 155318 8-Aug-2008 20:28
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You guys are great. The responses are very fast. Repair shops will just do what I'm doing and charge me $300 bucks to replace the mobo or chip.

However it might be better to pay them for a $300 headache than me spend days working on it.

Yep, its cuts out too soon for the bios to load. And upon removal of the new card it should revert to the old sequence.

Doing some google research its seems the cpu fan maybe the case.

I'll keep you posted. However if anyone else reads this and has some suggestions fire away.


267 posts

Ultimate Geek

  Reply # 155324 8-Aug-2008 21:12
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  My computer did the same thing, it turned out that the on/off switch was bracket broken, so when I turned the computer on, it stayed pressed and shut down again, I know this a low tech answer but like everone else here I first thought it was some thing more.

288 posts

Ultimate Geek
+1 received by user: 25


  Reply # 155327 8-Aug-2008 21:32
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I'll check that switch again. If I put a screw driver on the power switch jumpers that will eliminate the switch being the cause.

288 posts

Ultimate Geek
+1 received by user: 25


  Reply # 155988 11-Aug-2008 18:44
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New mobo =$150.00
New CPU=$187.00
New PSU=$75.00

Still no luck

Stuck on/off switch=priceless

Problem solved. The front on/off switch had become stuck. Oh well I got a upgrade out of it.

Cheers for all the feedback.

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