This could very well be what I encountered yesterday..
1. Turn laptop off.
2. Remove power adapter.
3. Remove battery.
4. Hold down power button for 40-60 seconds.(I believe this resets the bios.)
5. Now it should start up again.
This worked for me, good luck.
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I had a similar problem with an hp pavilion dv1000. I opened it to fix usb and Ethernet, put it back together to turn it on, booted once, and then never worked again. It sounds like a hard drive problem to me. Try burning a linux live cd (ubuntu is very user friendly, at UBUNTU.com) and booting off that cd. The live cd wont effect your hard drive, but if it is able to boot off of the cd, then the problem is with your hard drive. Hope i helped.
try taking it to a shop?
does the fan spin?
are there any other sounds?
try a new hdd
Fan Spins, Hard drive d0eoesn't spin, lcd doesn't turn on
can you eject the CD rom?
press like 7 keys on the keyboard at one time, does it beep?
can you turn it off by the button or do you have to take the barrery out ?
what make and model is it ?
I can use the button, and its an Hp Pavilion zv5000. It was given to me because the power supply was bust, so I opened it up (CAREFULLY) to fix that, After putting it together again it doesn't boot. The power lights come on , but the display stays off and the HDD doesn't spin.
I had a problem on my laptop that sounds the same as this one so I flashed the bios and it started working again
hope this helps
Are you using a mac or PC computer?
Its an Hp Pavilion,