Beep code 3x long 1x short (x2); M720Q

Hi all,

my M720Q beeps on startup (after 15-20 seconds) with no video signal at all:

3x long beep, 1x short beep, repeat (one time)

Can someone tell me, which the tiny is saying to me?

I first thought it is ram related (i replaced it), but this is 3x short 1x long.

Cant find the answer on google :(