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When i press the switch to start up the blue hard drive light comes on but not the yellow power light, it will not boot up and after a few seconds the blue light goes off and the no signal sign comes on, I have had a new powerpack fitted i year ago,any ideas ? Frank

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Strip the system down to the absolute minimum: unplug all of the drives, disconnect the speakers and any USB devices, and remove all but one memory module. If the system starts (of course it won't boot), one of the items you removed is defective. Add the parts back one at a time until you have a failure.

If it still doesn't start after the strip-down, swap the remaining memory module with another one. If that doesn't do it, try putting a video card in and using that instead of the on-board video (you have provided no details about your hardware, so I'm guessing at your configuration).

Caution: shut down the computer and unplug it before adding or removing any internal parts to avoid damage to the motherboard or parts (every time you add back a part). Do not touch any circuitry with your fingers; handle memory modules only by the edges. Failure to observe this precaution may cause electrostatic discharge damage to the parts (even if you don't feel the shock when you touch it). You can reduce the chance of damage by making sure you have bare skin touching the metal case of the computer while you work on it. It is not necessary to turn off the computer to plug in speakers or USB devices or remove them.

If the system will not start when it is stripped-down, either the power supply or the motherboard is bad.

Posted on Jan 02, 2011

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