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Fan are spinning fast,black screen and laptop is not boot up

HP Recommended
Hp 820 G1
Microsoft Windows 10 (64-bit)

My laptop on when i press power button black screen appear fan noise come our fast spinning nd then they off automatically



PC was working fine all these years, suddenly went to turn it on and loud fan noise, blank screen, pc won't boot. Have tried all fixes listed. Power cord is fine, f10 will not start BIOS. Took off back, cleaned fans, redid thermal paste on CPU/heat sink. all look good,  


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