Laser problems (not reading DVD media)

[FreeFighter]

After opening my PS2, for some dust cleaning, and putting it back together i had problems with reading PS2 DVD games, DVD movies, DVD-R. Before opening everything was reading fine. And HDLoader is still working.

I opened it again, checked if every ribbon connected correctly. While i was frustrated and wanted to put everything back together, i broke the Reset/eject ribbon aswell, that's already fixed though.

I tried turning the white COG under the tray, I've cleaned the lenz with a CD cleaner. Anything else i could do before buying a new laser?

It's a SCPH-39004, so just don't want to throw it away and buy a new one.