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Emachine flashing yellow lights, fans power up when P8 is unplugged

I was given an Emachine T2542 that went out. It won't power up and flashes yellow around the power button and the other light on the front but no fans. I unplugged everything from the power supply and individually started plugging them back in starting with the P1 (motherboard). This allowed the fans to start up. Once I got to the P8 (4 prong that attaches to the motherboard) the fans stopped. I'm not sure what this is for. I was told that the flashing lights could either be the power supply, power button or motherboard. I tried installing a new power supply but it did nothing at all, even when I plugged them in one at a time. The fan started when we did the paperclip test in 14 and 15 of the motherboard connection so it apparently works. What do you think it could be?

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  • AASessions Jul 06, 2008

    Thanks for the info. The old 250 power supply worked with it for 5 years and just went out so it was powerfull. The fans both turn on when I plug in the 20 pin to the motherboard. When I plug in the 4 pin CPU power connector, the cpu fan shuts off but the power supply stays on. There is no on/off switch on the old PSU. The new PSU is a 350 and it will not power up anything. Nothing works, not even the lights. I went through everything with a tech and we narrowed it down to the motherboard. I will be switching it out with a better one with a better CPU but $65 on Newegg.

  • thubbartt Jul 19, 2008

    This T2542 emachine power problems: replaced motor , and when turned on fan went on for 5 seconds and all turned off again. flashed green then yellow initially but shut down. I am new to these older machines but need to see a diagram of how to start unplugging what to track down the problem.

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I would also suggest that the battery in the motherboard be replaced.That battery is startup power for the computer and if the battery is dead you will have the same symptems of startup power problems!!!The battery you will be looking at looks like a large watch batteryand is flat slide the old one out and replace it with a new one and it should solve your issues!!!

Posted on Aug 21, 2008

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Did some research and found this site which will tell you which pins to test. It is possible also that its not powerful enough for the devices you have. I would try again only giving power to the motherboard pins, of coarse and the hard drive. If works then plug one device at a time.
Good luck

http://articles.techrepublic.com.com/5100-10878_11-1046822.html

Posted on Jul 05, 2008

  • Theresa  Smith
    Theresa Smith Jul 06, 2008


    Did some research and found this site which will tell you which pins to test. It is possible also that its not powerful enough for the devices you have. I would try again only giving power to the motherboard pins, of coarse and the hard drive. If works then plug one device at a time.
    Good luck

    http://articles.techrepublic.com.com/510...

  • Theresa  Smith
    Theresa Smith Jul 17, 2008

    Please be careful when installing a new power supply. System must be off and unplugged. Insert 20-24 pin on mother board then 4 pin plug on mother board first followed by drives and cards. DO NOT disconnect any power plugs or devices or device plugs when computer is powered up.

    You must turn off system each time your disconnect a device or plug from the mother board as well as power off when connecting new devices.

    Connecting the 20-24 pin and powering up without the 4 pin connected to mb can cause serious problems. Both must be plugged in before switching on power.

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