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Hp probook 640 g1 blackscreen, caplock and numlk blinks 5 times, Fan spinning Fast.

HP Recommended
probook 640 g1
Microsoft Windows 10 (64-bit)

My hp Probook 640 g1 just started showing black screen on startup, capslock and numlk blinks 5 times, Fan start spinning Fast,

cd drive indicator starts showing yellow instead of white.

I tried reseating the ram modules ( 4gb x2 ) it didn't work, then removed the cmos battery for 40 seconds or more still didn't work

I had to loose the laptop and insert and reinsert the cpu and clean the BIOS and closed it didn't work,

then I inserted One of the 4gb ram and it started working and stopped showing black screen and was booting normally.

But after A day and half it started giving the same problem.

Please What is the problem? 

I have changed the ram and the same problem still persist, before the laptop can boot properly I have to boot it maybe up to 8times  before it can come on.

Any Ideas of what can be wrong?

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