M17x R4, stuck on boot and continuous beep

Hello everyone,

Since October I'm facing a problem when starting my 2012 Alienware M17x R4. When I press the power button, its lights turn on, but the screen stays dark and these beeps are emitted. Strangely, there are a few rare times that it turns on normally, but then this problem returns if I try to reboot.

According to the Alienware Beep Codes Table, this beep means possible motherboard issue (covers BIOS corruption or ROM error). However, I already took my laptop to 3 technicians to try to fix, and even after changing the BIOS and the ROM, the problem still persists.

Has anyone ever experienced a similar problem or know how it could be fixed?

Thanks a lot!