Memorex MVD2042 DVD Player

Bought it. Brought it home. Took it out of the box. Hooked it up. Put a DVD from a rental place into it. Machine spit it out. Put another DVD into it. Machine spit it out. Tried to close the DVD tray without a DVD in it and it opened right back up again.

Turned it off, disconnected and reconnected everything (just in case I'd somehow made a mistake the first time), went through the same test cycle with the same results.

Checked the documentation enclosed to see if it shed any light on this behavior, no dice. Checked Memorex's website for relevant information, no dice.

Needless to say, this is going back to the store tomorrow.
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Update 3 days later: Immediately after I had written the above, I fiddled around with the machine some more. For some reason going into the setup menu got the darn thing to work. Yay! I actually got to watch part of a DVD on it!

Unfortunately the next time I tried it, it reverted back to its previous opening/closing behavior. This time I couldn't even get back into the setup menu. So back to the store it went.