Try another CD. My Beogram CD 6500 can be temperamental with certain newer CDs. (Particularly the hybrid ones with SACD/CD - sometimes they'll play, at other times not).

Once, when it wouldn't play a selection of CDs, I opened it up, cleaned the laser lens and had it going again no problems.
 

Mine can be temperamental if it hasn't been used for a while. Symptoms are - not reading the beginning of first track or failing to read to disc at all. With perseverence (keep putting the disc in again and again - it can take a good while) it can be coaxed back to life but I suspect it is the onset of the "motor needs lubricating" problem which was fairly well documented (although nt easy to do) on the old site.

There are those that offer this service (Dillen being one I believe) although it depends upon your location.

As Puncher suggests, this definitely seems to be a motor problem.
Too often the Beogram CD50 is diagnosed with a bad laser when the fault is actually lying somewhere else.

I agree that the faulty read CD's symptom indeed looks like a tired
laser but in more than 95% of the cases, the fault turns out to be
the spindle motor, the focus circuit or simply a matter of adjusting.
The laser block itself is an incredibly robust build, I've discarded
only one and it was because a previous repair attempt had
obviously failed badly and the focus coil was mechanically damaged.

Many repairshops reject repairs to the CD50 simply because it's
either too complicated, too time consuming, parts are no longer available or they don't have the necessary tools, test CD's, instruments, documentation etc. and that really is a shame.
Not all people see the value of these things the way we do and we
will have to face the fact that for your average repairshop, there's not
much economy in putting maybe 5 or 6 hours in a repair of a 20 year old CD player.
For the hobby repairer things look different and it can be
both educational and a challenge.

Servicing a CD 50 is nothing like your average japanese player, the number of build versions, aftermarket modifications and upgrades
is a complete jungle, not two are alike but in most cases
it can be done with a good result.
I've repaired countless of these nice players and they're worth it in my opinion.
Most send in the complete machine which allows for a complete checkup,
tray repair (another common issue) etc. but some send only the motor.
The motor is of the brushless bell-anchor type and taking it apart
is kinda tricky. The magnets inside and even the metal bell
itself will break very easily.

Martin

As this is a common problem that often crops up on the forum can we list willing repairers who can complete a full service and calibration, as outlined by Dillen above, and their location so that people can follow up and have them serviced should they wish to do so. 

A price estimate (for motor cleaning and calibration) excl. shipping etc. would also useful as a guide.

I have repaired and overhauled about 20 CD50s in the past couple of years and electronic faults are rare most machines require mechanical maintenance and some adjustment. I would be happy to discuss repair options, I am based in the UK please feel free to contact me

 Stuart