CD Player works in the repair shop but not at home

Maybe the repair critter fixed the wrong thing. Get your money back if possible, and buy another CD player. Or a DVD player; some models claim to have good DAC chips. Or laserdisc player, although it's rare to find one that has S/PDIF out (avoid the Sony ones, unless it's free and comes with a guarantee).

Well, I tested it in the shop and it worked perfectly, so I don't see how he could have fixed the wrong thing. Unfortunately, the money I spent on repairs will not buy me another CD player (at least of the same quality).

"Do not now seek the answers. Live the questions, resolve to be always beginning" Rilke

Buy a CD player at a used store that plays 100 discs. If it doesn't have scratches on it it will probably work. Use a CD lens cleaner monthly. They have them at Dollar Tree.

Thanks but I have no interest in buying another CD player. The one I have (an Arcam) is of superb quality and I just want it to work. I will take up your suggestion about getting a CD lens cleaner; however, if the CD player is not reading any discs, how would it read a CD Lens Cleaner?

"Do not now seek the answers. Live the questions, resolve to be always beginning" Rilke

If it spins it might help. CD and DVD players usually aren't worth repairing unless, of course, it's superb quality. Most of the ones in the pawn shops work just as well and usually only cost about $20.

Take it back to the shop. Any honest repair person will do what it takes to make it right.

Alternatively: Arcam probably bought the CD mechanism off the shelf, so it's unlikely that the only source for replacements is Arcam. They may have bought an entire CD player and modified it, or just the CD mechanism. The Philips CD mechanisms were legendary; maybe you can ID it from the pictures on this page:
http://www.thevintageknob.org/philips-CDM.html

Thanks but if it works in the store, there is nothing further the repair person can do. The question I need to find out is why it works in the store (I tested it myself) and why it only works some of the time at home (I have tried plugging it into different outlets).

"Do not now seek the answers. Live the questions, resolve to be always beginning" Rilke

Does it still work in the store if you take it back there again? Maybe something shook loose when you brought it home.