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emachine t2792


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#1 millmik

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Posted 20 April 2012 - 07:11 PM

The fan doesn't shut off when computer is shut down. The usb ports don't work and the computer freezes up when a usb drive is inserted. emachine t2792. win xp pro.

Thanks! not in standby mode. reformatted xp. deleted usb root, was recognized ,but doesn't work. used microsoft fixit,didn't work. it has a phoenix bios. could it be bios or motherboard heat sensor defect? installed new power supply, same result. reinstalled all drivers including chipset. device manager doesn't indicate any usb controller or root problems.

Edited by millmik, 20 April 2012 - 10:35 PM.


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#2 noknojon

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Posted 20 April 2012 - 07:32 PM

Hi -
The first basic check -

Check to make sure you're not going into Stand-By mode.
Click on the Start Menu....Shut Down and make sure you're not clicking on Standby.

Regards -
Extra install SpeedFan to keep an eye on temperatures also

Edited by noknojon, 21 April 2012 - 02:34 AM.


#3 James Litten

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Posted 21 April 2012 - 08:04 PM

Hi

Just wanted to jump in and ask how is the fan powered? Is it plugged into a standard jack on the motherboard or a MOLEX connector from the power supply or something else? Sometimes when repairing a bad fan connection, people will power the fan by connecting it to the power on a USB port and it will do what you describe.

James

#4 millmik

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Posted 22 April 2012 - 01:25 PM

fan is attached to normal motherboard plug-in.

#5 James Litten

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Posted 22 April 2012 - 03:13 PM

Just want to confirm, it is the CPU fan that continues to run after powering down not the PSU fan?

What happens with these a lot of times is there is a problem with the PSU and the motherboard does not have sufficient protection and gets damaged. Since you tried replacing the PSU and made sure that it was being shutdown and not just put into standby, we are looking at the motherboard now.

The problem with the USB ports is a clue. It sounds like they are fine until a load is placed on them. Try this to confirm that.
Power down the machine.
Unplug it.
Plug in the USB drive
Plug in the computer and turn it on.
Let us know if it boots and if it does can you see the USB drive.

If this produces problems then there is a good chance that a component on the motherboard is damaged.

James

#6 millmik

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Posted 22 April 2012 - 07:35 PM

Hi, James, thanks for all your help. It's the psu that doesn't shut down. it's a friend's computer so i'll have to get him to bring it back to try the usb.

Friends bring me their computers hoping I can solve their computer problems. I think your right about a strong possibly of a damaged motherboard. You can turn off the fan with the psu switch then turn the switch back on and the computer will power up normally. if you insert into the usb drive while the computer is running it immediately freezes up the computer. You then restart the computer and it boots up normally.

Edited by millmik, 22 April 2012 - 07:45 PM.


#7 James Litten

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Posted 22 April 2012 - 11:05 PM

In that case, take a look at the power button switch on the computer.

After shutting down (but the fan continues to run) try holding the power button down for 5 seconds or so to see if it shuts off the fan.

You can also pull off the wires for the power button from the motherboard and put the wires for the reset button on there so that the reset button can be used for the power button. That way you can tell if the problem was with the power button being broken. (I've seen this happen before but usually this makes it so the computer does not turn on rather than the fan staying on)

If that doesn't do it then something on the motherboard isn't sending the PSU the proper shutdown signal.

James

Edited by NeverSayDie, 22 April 2012 - 11:06 PM.





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