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That sounds as if the cooling fan is working very hard. This normally means that the cooling ducts are full of dust and other rubbish. You may be able suck most out with a vacuum cleaner or blast with an air duster. Failing that, it's taking it apart (you will need a manual) to clean the heat sink area around the cpu.
1.If the notebook computer is running solely on battery power, plug the AC adapter into the notebook. 2.Shut down the computer if it is running. 3.Press the power button to turn on the computer. 4.Press f10 when the HP/Compaq logo displays. 5.After the BIOS Setup Utility displays, use the Right Arrow key to select the Diagnostics menu. 6.Select HDD Self-Test options . 7.Press enter to display a list of HDD/Self-Test options. 8.Select Notebook Hard Drive and then press f10 to display an Estimated test time . 9.Press f10 to continue. The Hard Drive Self Test executes a Quick test , a Comprehensive test, and a SMART test. If test reports pass then perform installation of OS else hard drive has gone bad
unplug power supply remove battery and let set for a bit.replace battery and try to turn it on..you probally have corrupt the hard drive..if all indicator lites are flashing then its working and maybe the screen has been corrupt or broke.if you have a desk top monitor around you can hook it up to your laptop and see if you can see anything on that,and if so you can go in and check all the drivers are working properly especially the monitor and graphics..yes a desk top screen will hook rite up to a laptop.
Look very closely at the screen when its on, see if you can see a faint image in which case the ccfl tube in the screen will be dead.
Also try the laptop on an external monitor.
Otherwise if you know what your doing, remove the battery, hard drive, optical drive, all but one stick of ram, modem/wireless card and try again. There is a small chance it will be the cpu or motherboard.