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HP Recommended
ProBook 4510s
Microsoft Windows 7 (64-bit)

I have two HP ProBook 4510s laptops which both had the same issue of not booting up.  One of them has started working, but on the other the issue remains.  Upon pressing the power on button, the wireless indicator light on the front of the laptop continuously changes between orange and blue.  I can hear the fan running, but there is no output on the screen.

 

I've tried the usual steps of removing the AC power and battery and holding down the power button, but to no avail.

 

Has anyone else had the same or similar issue?

 

Thanks

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