I honestly have no clue what can cause this.. My experience with electronics is quite good, but when it comes to the Sega CD, it's a whole new world for me..
Simply put, it don't like games.. It plays music CDs fine, I am playing an Aerosmith CD on it right now (real printed CD).
If I play a CD-R music CD, it takes it about 20 seconds before it even realizes it's a music CD (on the printed CD above, it's pretty much instant)..
On a Sega CD game however, it NEVER gets passed "Checking Disc", and it completely hangs there, sometimes the "Access" light on the Sega CD will turn off, stay off, and blink 4 times, and repeat.. OR, it seems like it's really "trying", but just says "Checking Disc"..
I have taken apart the Sega CD unit, and I swear, whoever owned this thing last, must have been hiding something from the cops.. Inside, not only is there coffee stains on the motherboard, but there is cocaine powder!!! (i am NOT kidding, had it checked out, it really was cocaine)..
I cleaned it up pretty good, and used a multimeter to make sure there is no short, but it still fails to boot..
Though, it's not a total loss, it DOES boot sometimes, and that's a big "sometimes".. When it boots, it's usually running perfectly fine, no problems.. But sometimes when it does boots, it's very slow, music not playing when it should (CDDA music), or it just randomly freezes up...
Any ideas as to what else can be wrong with it?