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Acer Aspire AX1200 new motherboard, still won't run

By paulinchgo ยท 5 replies
Mar 12, 2011
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  1. In a previous post I described problems with my son's Acer Aspire AX1200 desktop which would start to power up, then power down, start to power up, then power down in an endless cycle. The computer would not even start to boot. We thought it was a PSU issue and replace the power supply. No change.

    We figured it was the motherboard and carefully replaced it with a new unit. We took our time and removed all the cables and connectors from the old motherboard with great care. We installed the new motherboard and reconnected everything as before.

    We connected the monitor, mouse, keyboard, and power cable and hit the power button. It started and booted up. Yay! Windows started up and the Windows desktop came up. High fives were exchanged!

    Without warning the screen went blank. No response from mouse or keyboard ctrl-alt-delete. We powered it down and attempted to restart it. This time the blue power indicator light flashed once and the fan started to run at full speed. The computer didn't start to boot... just sat there with the fan running wild. Powered down and tried again... same thing.

    Tried a cmos reset by removing the battery and holding down the power button, then replacing battery and power cord. As soon as the power cord is attached, the fan starts up running at full speed before even touching the power button. It stops and powers down when the power button is held down.

    This morning, I removed dvd/cd player, hard drive, and checked the memory card seating. Then I plugged in the power cord. This time the fan didn't run wild. It tried to boot, but couldn't continue because no drive to boot from. I shut it down, connected the hard drive and tried it again. This time the fan was normal, blue light was on, boot sequence completed normally and Windows started. Great!

    But this lasted only a few minutes, then screen went blank. Powered down tried to restart it.... and we're back to the fan running at full speed and no boot.

    Sorry for the long post but I wanted to give all the details. I suspect a short of some kind, but I've been over it again and again and can't find anything loose or misaligned, and no screws loose.

    Any ideas or suggestions much appreciated. Could we have damaged the motherboard?

  2. Mark56

    Mark56 TechSpot Paladin Posts: 1,880

    All these symptons would suggest a faulty power button, any intermitant fault could be causing it to trigger a shutdown. Try giving the button a good blast from a can of compressed air, it could just be dirt trapped around the button causing it to stick.
  3. paulinchgo

    paulinchgo TS Rookie Topic Starter

    Thanks for the reply. We already tried blowing out the power switch with compressed air. No change.

    The power comes on and the blue light flashes once then the fan starts up and runs at full speed... no further progress with boot. It just sits there with the fan running at full blast.
  4. Mark56

    Mark56 TechSpot Paladin Posts: 1,880

    Has the memory been tested? if you have more than one stick of memory try running it on just one stick, then swapping so you test both of them.

    Another idea would be to remove and disconnect the keypad.
  5. Trillionsin

    Trillionsin TS Evangelist Posts: 1,761   +369

    Try this method first... I dont think this may be the case... but try testing the hard drive and running scandisk to see if its going bad.

    memtest and spinright

    Old, old programs... lol but they still work

    Edit: (at least to me, anyways. :))
  6. Mark56

    Mark56 TechSpot Paladin Posts: 1,880

    Thanks Trillionsin, I was going to suggest that in the next step. For your advise and Paulinchgo the old programs for testing memory and hard drives may find some major faults but can also miss minor errors. These guides below are the best methods for testing hard drive and memory.


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