PS2 not turning on

[Vale1981]

Hi guys, i'm new in the ps2 work and i'm looking for help.

A weeks ago i bought a second hand ps2 (already equipped with a matrix infinity modchip), everything was fine until last night: when i was playing with some friends suddenly the game freezed i reset and played again but it freezed again, this time i turned it off and changed cd but the ps2 didn't turned on, the led became green for a fraction of second and then go back to red. I disconnected the power and waiting a while (maybe it was overheated) plugged again but the problem remains.

Any suggestions? If u need other information tell me please.

thnx for any response