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Try this first:

1. Remove the battery and AC cord. Remove the bottom cover/covers of your laptop.
2. Remove and reseat your RAM modules.
3. Replace your covers.
4. Hold down your power button for 1 minute (Battery and AC still disconnected).
5. Replace your AC power (without battery) and turn on.

This is called a hard reset. If it works COOL, then replace your battery. If not then we will try something else. Good luck.
 

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There are various faults that can cause this, hardware, corrupt bios, bad connections, bad solder joints on the mobo and a dead mobo.

So, remove your HDD and start your laptop. If its a dead HDD this should happen:

Power on – Fan starts – HD light on – POST screen appears – HD lights goes out and black screen appears with message "Operating System Not Found" and remains at this screen.

This is the first and easiest hardware fault to diagnose.
 
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