I am having some issues with an HP 250 G8 laptop (4K803EA). The pc, when turned on, has the LED on but stays on a black screen. I opened the computer, and noticed that the fan spins for a few seconds after pressing the power button but then stops. I tried swapping ram with a working one taken from another laptop but nothing happens.
The only thing that seems working is the HP Bios Update utility, that I can open turning on the pc while pressing Windows + B keys, as described on HP website. It seems to complete flashing the bios with no errors, but then still no boot. I tried putting the bios files on a USB drive as well.
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When you say the BIOS update works, are you seeing something on the screen? If you connect the computer to an external monitor do you see anything?
Try booting with the HDD disconnected. Try disconnecting the battery and BIOS battery (where is it on this model?!) for a few minutes.
You would still need good RAM to get into the BIOS update…
GPU failure, since a text-mode boots but not much else?