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HP Compaq Pro 6300 MT - not booting followed by HIGH fans

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HP Compaq Pro 6300 MT
Microsoft Windows 10 (64-bit)

Here is the problem we are having on 5 @ HP Compaq Pro 6300 Microtower systems:


Switching out PSU,  checking RAM,  replacing CMOS batteries............ can't get the systems to boot.

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From the video, it looks like the screen remains black all the time -- is that the case?


If so, you should try pressing F10 repeatedly during reboot to get into the BIOS settings.  Once there, go through the settings for boot options and see if you have them set so the detail messages do not display on the screen.  IF so, change the settings to see the detail POST messages -- and reboot.


IF that works, at least you will see something on the screen that might provide clues as to how far into POST it is getting before it stops.

***If my post helped, click the thumbs-up symbol to say thanks***

***Please mark Accept As Solution if my post solved your problem***

I am a volunteer and I do not work for, nor represent, HP
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