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HP Recommended

Please, my laptop screen refuse to come when I try to switch it on. My problem is getting complicated day by day, different information keep coming on the screen when I try to switch it on. At first it's started with "please, install an operating system on your hard disk. F2 system diagnostic. Your device run into a problem and  needs to restart, we are just collecting some error info then we'll restart for you".

Ple

At first it had been coming on and off on and off but now it'sno longer coming. Pleasease help me out, 

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