It happened to me and I went on the HP site and found how to fix it. Under the keyboard you can find the ram. If you take out the battery and disconnect it from the mains, then take the ram out and put it back in again, it can sometimes solve the problem. If not then there's something wrong with something else inside it.
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With the older Compaq Armada E500 Notebook PC, I believe;
1) Remove the CMOS battery.
2) Leave it out for 30 minutes.
3) Press the Power On button, and hold it for a count of 10 seconds. Let go of the Power On button.
Press it again. If the Power On light comes on, hold the Power On button in, until the light goes out. Keep pressing, and holding the Power On button in, until the Power On LED light does Not come on anymore.
Reinstall the CMOS battery. WAIT 1 minute, turn the laptop on.
If this doesn't do it, there is a capacitor inside the laptop keeping residual power. There may be two copper pads that are briefly touched across, to dissipate this residual power.
Perform the removal of the CMOS battery first. If this doesn't work I'll try to find info on the copper pads. (They are usually under the Wireless Card, and a small piece of Mylar plastic sheet)