Dell inspiron 1521 black screen

Welcome!
On my inspiron 1521, when the power is on only a black screen (do not even get to the BIOS), the fan is operating but none of the signaling LED lamps do not light up. I've tried removing the WLAN Card, CMOS battery, RAM. Unless you remove both RAM, flash me right and medium-sized LED flashlight, while left off.
Please advise what could be wrong?

P.S. This occurred after I did pasword recovery in the User Account, then I could do some work with the admin account, and since then it happens.

Best regards,

Joze