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Two things to try first before we go further with the diagnosis: 1. Try to power up the netbook with the external hard drive disconnected & see if it will work. 2. Try powering up the netbook from the AC adapter only with the battery removed.
Does the fan on the power supply run? As you say the power on switch lights up and so does the motherboard, means that the power supply is working. Monitor gets power from the socket on the power supply. Try plugging it in the wall socket. Try to unplug the main power cord from power supply to the motherboard. The one that has a broad plug at the motherboard end. Replug it and they power on the PC.
Hello there: please try this first unplug the power to the computer next open the case and unplug all of the cables and cords that connect to the harddrive cd rom ect ect now locate the power supply cord that goes to the motherboard and disconnect press the power button on the computer for 20 seconds and also if you have a reset button press it . what this hoes is releases any stored esd that is in the computer .. now plug in the power supply back into the board and plug in the power cord and try to boot the computer and see if it comes on if so great just plug in the cords to the cd rom harddrive ect ect and than reboot and you should be ok
Turn power off and unplug power from computer.
Unplug printers,backup drives and speakers.
Open case and unplug power supply from the board.
plug power cord back in press the power button.
Of course nothing will happen.
unplug power cord again.
plug power supply back into the board.
plug power cord backup and press power switch.
If nothing happens unplug power cord again.
pull out your memory sticks and plug cord back in and press power button.
Of course not much will happen.
But really something is happening to your computer so continue.
Pull power cord and replace memory sticks.
replace power cord and press power switch.
Continue this pulling out pci cards one at a time until you find out what the problem might be.
Try different keyboards and mice too.
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.
Either the new power supply you purchased is not functioning correctly. But, assuming it is now that you are getting some form of power to your PC, it is very likely the motherboard. Whatever fried your old power supply (or it could have just been the power supply itself) most likely fried your motherboard in the process. Probably not the CPU since the MB can't even post.