IdOp, the HP support website suggested the battery removal procedure. And you have to press down the "Power On" button for 15 seconds. I tried this a few times but it did not work.
Head_on_a_Stick, I don't use any bootloader.
Jggimi, the USB stick did not boot. Normally I can choose in the BIOS startup screen to boot from disk (the default), from CD or, from USB. But I don't get that far.
On Youtube a video called it the "Black Screen of Death", which seem to plague HP laptops. My laptop was handed down to me from my daughter. She bought it through a collective purchase at the Technical University in Eindhoven, when she was a student there. Actually it is a Compac 8510w model, that was rebranded as HP Compac 8510w.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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