cd's unstuck, now grinding!

kids had 2 cd's jammed in there. i was able to remove them.

now, the player will not fully accept a new disc on its own. after giving it some assistance, it accepted the disc in whole - and then grinds on the disc for a few seconds before telling me DISC ERROR. it will not eject the disc fine, but will not read any discs (tried 4 different discs).

help!