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Try holding the power button down for several seconds. Or disconnect the power (pull the plug or remove battery). When you turn it back on, it will probably tell you that you didn't shut it down properly and hopefully you've saved whatever you were working on.
few things to try you can disconect the hdd the dvd rw drive and anything elce conected to it appart from the motherboard and moniter then try again (just becouse you tryed to check the psu it my well still be completly broken ) i would probly suspect the motherboard in this case thought i would try a new psu first as this cost less (10 pounds from ebay) hope this helps ps reset the bios and cmos too
that your unit has some sort ofPSU
fault, or a problem that is shutting down the Power Supply Unit, PSU. The noise is what gives it away. This
happens so that no further damage, and possible fire will occur. You need to take the unit to a reputable service centre/man
and ask for a firm "Quote" for the work to be done. It is that sound that gives it away, this is a typical
switchmode Power Supply problem.
Try hitting the "Windows" key on your keyboard to bring it out of sleep mode. The "Windows" key is generally found on the bottom row of the keyboard, near the Alt and Ctrl keys, and it has no letters on it, just the Windows logo. That key brings my Windows Vista machines out of sleep mode when other keys won't.
As for the power button, anytime you need to force a computer to turn off, you can press and hold the power button to do so. Usually, you need to hold the power button for 5-10 seconds and it will shut down. Use this option with caution, as it turns the computer off without running through the shutdown process and can cause you to lose data.
remove battery plug in power...see what happens ...nothing happens press and hold power button until you hear response(shut down)press power as usual to boot.if it doesnt work first time try a few times more remember to keep power button pressed to shut down.
HP Support: Try resetting the unit by unplugging the unit while its on, then holding on the # and 6 keys plug the power back in an continue to hold the # and 6. The printer will power itself down, the reset is complete; turn it back on using the power button and attempt a copy. If the unit has never been able to make a copy, it is likely that unit is defective.
sounds suspiciosly like your chord fitting is damaged(loose wires at connection)and shorting.if possible try a friends power supply with same connecter type before renewing cos could be faulty(loose)connection at pc(inside)constant pushing and pulling of connections often causes 1. loose split or disconnected wires at male connection or 2.loose pins on motherboard female connection or broken housing (not difficult to repair)more difficult to find out how to get to internal connection.