Disc tray wont open!

[dieter]

I have just had my ps2 chipped professionally with a Neo 2.2.
The ps2 has no disc in. I tried to put a game in and it appears the disc tray is stuck. The eject button lights up and the tray makes a noise as if its trying to open. Nothing happens. I dont think its the ribbons because the light lights up and the tray tries to open. Is there anything that i can do to fix this without taking my ps2 apart? Thanks.