I have been playing a DVD, it is slow to load but now it takes forever with me inserting and reinserting for at least 1/2 hr. It isn' t the dvd it plays on dvd player with tv. also other dvds load okay on pc. It is clean and loaded upright

As I understand your post, your problem is that this one DVD, when inserted in this specific drive, within seconds is spat back out and you have to try to re-insert it again...over and over until it eventually accepts it and then plays ok?

If that is the case, you may have a situation where the DVD is manufactured just barely within specifications. This can allow it to play normally in a wide variety of other players, but NOT in a specific player. It may be a combination of the player being slightly miscalibrated or also manufactured slightly out of spec, AND the disc being slightly out of spec that causes the problem.

This would be an additive combination of manufacturing tolerances of that specific player AND that specific DVD. You might never see the problem with any other DVDs you try to play on that player.

Also, as the player got older its compliance with specs may have deteriorated and so you see a degraded ability to play that particular DVD. (e.g. guide tracks get worn just a bit, the heat of the computer causes the internal R/W head support system to deform a little bit more over time, the disc centering mechanism becomes less reliable, etc)

Vertical loading players can be more sensitive to manufacturing issues as the discs can be loaded minutely off-center more often than in horizontal loading players. The self-correcting electro-mechanical and optical mechanisms in the player may be unable to 100% compensate for a disc that is not loaded exactly on-center and you start seeing increasing load/play-back problems.

Some DVD players also have a movable plastic tab in the DVD player tray that you need to flip from "horizontal" to "vertical". This MAY help improve the player's ability to more reliably handle vertically inserted DVDs. This is not a common feature but it is something to look for.

It could also be a similar specification compliance issue with the production of the optics on the disc and the optics subsystem of the player. The DVD could have been produced near the end of life of the 'master' used to produce that particular movie. Again, it's probably a combination of near out of spec DVD and near out of spec or even slightly out of spec player that causes this unique situation with the end result being the 'problem' DVD plays fine on other players, and other DVDs play fine on this player.

By the way, if this is a DVD that you have burned yourself, then another factor that can come into play is time. Burned DVDs can degrade over time...especially cheap discs. Even if the data verify/check out 100% at the time you burn them, you may find it plays back with drop outs or pixelation, or fails to play at all some months later. Here again, some players will be less susceptible to the degradation and may work fine...until perhaps a few more months pass and the disc has degraded even more.

Thanks for the prompt reply. I bought this DVD. I will just have to put up with reinserting. It doesn't spit it out, it stays in but will not load right away.