Question about Dell XPS™ 600 PC Desktop

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Light and fans come on for one second then shut

When I press the power button on my XPS 600, the light comes on and the fans turn for one second, then shut down.

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Hello and Welcome to FixYa!

It seems that there is some hardware conflict or hardware problem (Heating/malfunctioning). To trouble shoot the problem you need to remove all the peripherals (Sound Card, Modem, T.V tuner card,e.t.c.). Remove the RAM from the RAM slots. Use a soft clean cloth to clear the dust particles if any.Re install the RAMs to the Ram slots. Remove extra drives (If any Installed in the computer). Try changing the power socket to any other power outlet (If Possible). Press the data and power cables to make sure that they are inserted properly...
Above are the steps to minimize any hardware compatibility issues. If the problem still persists, you need to cross check each hardware Physically.But that would be discussed later if needed. Please each possibility one by one carefully and you will have your trouble resolved.

Best of Luck,

Please Do Rate the solution, If you think this helps you,


Posted on Aug 01, 2010

  • 9 more comments 
  • bob7297 Aug 01, 2010

    Ok I've done that. Same problem no matter which parts are removed. One thing I did notice was that the fans turned on for a split-second when I plug the power cord back in.

  • Waqar Hassan
    Waqar Hassan Aug 01, 2010

    Ok! Remove the BIOS cell and wait for 10 seconds and re-insert it, Secondly remove the main Power cable (that comes from PSU to motherboard), remove that cable and tightly insert it to the socket. It seems like that the PSU is making trouble and needs to be check physically and replaced if faulty... You can cross check the PSU, if you are available with...

  • bob7297 Aug 01, 2010

    I don't have a schematic and am communicating by iPhone. Where is the Bios/ how do I recognize it?

  • Waqar Hassan
    Waqar Hassan Aug 01, 2010

    There is a small cell (battery ) installed on the motherboard. Usually Shinning Silver in color with black or blue jacket. You need to remove that cell and then re insert it after at least 10 seconds. This will restore the BIOS settings to default one.

  • bob7297 Aug 01, 2010

    No change. How do I check the psu?

  • Waqar Hassan
    Waqar Hassan Aug 01, 2010

    Here is the simple way to check the PSU using a multimeter:

    1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.

    2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.

    3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:

      • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.

      • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.

      • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.

      • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

  • bob7297 Aug 01, 2010

    I will do that shortly. In the meantime, however, I have onther symptom. When I unplug P2 from the MB and plug the power cord into the PSU, the fans on the PSU run continuously. Whe P2 is plugged in and I plug the power cord in, the PSU clicks, all the fans spin. The PSU immediately clicks again and all activity stops.

  • bob7297 Aug 01, 2010

    You directions say to turn on the computer to chech the voltage. The problem is that the computer won't turn on.

  • Waqar Hassan
    Waqar Hassan Aug 01, 2010

    Unplug P2 and then check....

  • bob7297 Aug 01, 2010

    I checked the Bay 1 connector because it has both 12vdc and 5vdc. The 12vdc reads about 15vdc and the 5vdc reads about 12vdc.

  • Waqar Hassan
    Waqar Hassan Aug 02, 2010

    The PSU is giving excess voltage... i-e It is malfunctioning.... I would suggest you to replace the PSU and then check... (Please Do keep in mind, that over voltage might had damaged the Main board components....).



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