text: sashawhitefur and riga hit it on the head!!! good job!!! check everything is connected. Make sure that on the ribbon cord that the end one is connected to the master,make sure that the jumper on the back of that player is on master. The middle connection on the cord should be connected to the slave player check that the jumper on the back is on slave. Go to my computer,click on control panel,click on system,click on hardware,and open the device manager and see if the driver for the player is still installed it will also tell you if it is working properly. If  you can only find the player that is working ok and not the 1 that you are having problems with then the driver is either corrupt or deleted itself and you need to reinstall the driver. If you dont have the install disc then disconnect both the power cord and the ide ribbon cable from the player. Boot the computer up wait about a minute and then turn it off this will clear the player from the bios if the driver is corrupt and not working right. Once you have done this reconnect the 2 cords and boot the computer, plug n play should pick it up and ask you if you want to install it, click yes, it will then ask you from where do you want to get the driver from, if you dont have the install disc check the box that says search Microsoft Web site, also check the box that should say C DRIVE have it check the WHOLE C DRIVE. Usually HPs drivers are on the list and you will get a message telling you that it has found a suitable driver and asking you if you want to install it click yes, after it installs the driver restart the computer which will put the driver back into the bios settings and see if it works. If after all this it still doesnt work then it is time to by a new player. Dont waste your money on an expensive one when you can find one just as good for around 50 bucks. All you want to look for is one that has a high speed burn rate (52rpm on a cd burner) (16rpm on a dvd burner)you didnt state if its the dvd player or the cd player that doesnt work and I dont feel like going into HPs web site to look up a350n.. If it is the cd player you can stll burn a cd on the dvd player, by making a file in the C Drive copying the cd to it and then burn the cd from the file.\n\n              GOODLUCK!!!!\n                    ZEUS