ThinkPad P40 Bios help

[gelidd]

When connected to the power brick, the power light turns on and the FN key lights up. The fan also spins, but there is no display, either on the lcd or over HDMI.

If I remove the ram, it does beep.

I don't have the serial number or the actual model number, but it is a P40 with the board number 14283-2 448. 05107.0021. I download one from the forum for 14283-2 448. 05106.0021, but now even the ram warming beep is absent.

Help is much appreciated!

[gelidd]

Since I posted the request, I have familiarized myself with the process of cleaning the ME region of the bios. UEFITOOL reported an ME version of 11.8.70.3626, which I downloaded and wrote to the extracted bios. After flashing this cleaned bios, now the beep is back but the display is still off, both on the LCD and via the HDMI. Since someone else worked on this laptop before, I wonder whether he flashed the wrong bios with the wrong ME version. If someone has a working bios for the board (agan 14283-2 448. 05107.0021), I highly appreciate if you can share it. Thanks!