Another cuase and while you have the dvd drive's lid off pop off the white disk lock that in the lid and stick a disk in the tray and set that on top of it like it would as if it were still attached in the lid and power the system on.
See if it is spinning the disk still and if not you need a new spindle motor this also will cuase the console not to read anything becuase the disk cannot spin.
another thing to try it clean and relube the laser's guide rails these are the 2 pole's one on each side that the laser slide's back and forth on.
ps2's have 2 pots one for dvd and one for CD-R have you tried a cd-r yet?
if they bothe fail it is some type of laser issue if one work's but not the other more then likely a pot tweak would do it.
all else fails send it to me
