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When it is finished, Put back and try again. Then get help or if you do how to do it, Take the HDD out, scan it on another computer with external HDD+ USB connector. If all this not worked, Try to jingle the power cord from the laptop entrance see it is loose. If you do not, Try to do Defragmentation from start > All Programs > Accessories > System tools > Disk defragmantation. Scan your computer with Virus Protection If you have the program. If you do, Then Use your Arrows Up & Down go to safe mode and wait to load. Take of battery, Connect the power, Turn on the laptop and started to tap "F8" Randomly a few times. Try this first but again I need to know your model number. First Harddisk failure, second Motherboard failure. What is your laptop Model #? What OS is on it? Two things can be problem. Hardware : You need to replace either Inverter, Blacklight, or everything. Workaround, start windows with lid at 30 degree angle

Open up the speaker cover and see if your lid actuator switch that come in contact with the magnet on your lid cover is stuck or not (find where the magnet is in the back of the front lid cover, trace where the magnet area actually touches the base of the computer and you will find the switch). Magnetic On/Off Switch to detect of Close/Open Lid : Your magnet switch is fubar some how. Electrical : Remove battery, unplug power, hold power button for 60 seconds, turn on computer with power plug only, then shutdown, add battery and restart

Software : Try Fn + F5 or something like that So there are many problems which will cause issues of the screen : Note from Truvu17 : Just to update everybody on my diagnose. It worked for me! Just shutdown, put the battery back in you're good to go. Then reattach the power and attempt a boot.

Unplug the power, remove the battery and then hold the power button for 30 to 60 seconds. The DVD drive would spin up and attempt to read a disc if one was in the tray but still would not boot. The HDD would spin up but the HDD indicator would not come on and would not boot.

On power on the screen would stay black, no POST, nothing at all on the display. I had the same problem with my HP DV6599.