820 2838 A fan spins, no chime

[DosPH]

hi. i have here a 820-2838-A air. all voltages are present. green and orange light when magsafe is plugged in and with batt, turns on and fan spins. but will not post or chime. no liquid damage also. any ideas on this.

 

[2informaticos]

Test USB activity first.
No liquid, but how it happened, some history?
Try BIOS now.

 

[DosPH]

Reflashed bios earlier and its all good. dont know history why bios was messed up.