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Computer LED turns green when power button is pressed, fan operates loudly, nothing shows on screen

HP Compaq 8000 Elite Small Form Factor
Microsoft Windows 10 (64-bit)

When I press the power button, the LED light turns green, and after a few seconds, the rear fan operates very loudly, but nothing shows up on screen. My TV says "No Signal". I've tried using a HDMI cable, and also another cable (blue with screws on either side, I don't know the name of it), but nothing works. I've also exhausted the HP virtual assistant of its solutions, to no avail.

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