I have a Dell 5150 and the lower DVD tray keeps opening and closing (constantly) without either electronic or manual instruction. It only happens after the CPU has been on for 4 plus hours (or so). It's driving me nuts. It stops (for a while) when I switch off and re-boot.
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Just below the CD/DVD tray there is a tiny hole. Insert a straighten paper clip in this hole and gently push the paper clip until the CD/DVD tray pops out. You can now pull the tray out until it is in the fully opened position to remove the disc. Try pushing the eject button to see if the tray closes, then push the eject button to see if the tray opens. If this foes not work then the CD/DVD drive is faulty and it needs to be replaced.
That's probably someone who pranked you by setting scripts or programs on your machine to do that. Just run dtrace or something to find out what programs are looking at media status (for 'closed') and decide whether any of them aren't familiar. Depending on your OS it could be a pretty small script or program....
It may on the other hand be something familiar whose backup function you haven't used or addressed in a while....
those dvd tray are hard to align back. you can purchase the drive for cheap on the internet. example if you search Dell Inspiron 531s on Google http://www.discountelectronics.com/index.php?l=product_detail&p=2815
In 99.9% of the cases where a CD player or reader has problems with the tray, even if it is not a computer CD tray, it's just because the sensors inside the device that tells it if the tray is open, closed or jammed are covered with dirt, dust and/or grime and just can't find the tray's position anymore, so it tells the reader that it is jammed or whatever and has it try to open it up all the time cause it never receives the signal from the sensor telling it that it is now closed and ready to go. So if you are good with electronics, you can take apart the unit yourself and locate and clean all the sensors with either contact cleaner or rubbing alcohol and put it back together again, and it should work fine now. If you do not want to risk damaging the unit, take it to your local technician and ask him to clean the sensors for you.
This problem occurs when your drive try to read but connot get any thing. so there are two possibility 1> that your lens is not working or its fail. to solve this try lens cleaner cd and if then also not solved than your lens is no more working.
2>Other thing is that when it try to close the tray it might stuck little out so push it properly and than check it.