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If there is nothing on the disc, it will read, "no disc". It will only read and/or identify discs with media loaded or burned onto it. Your unit is a player, not a DVD+R (recorder). Can record VHS, but not discs.
what kind of media are you loading? is this a DVD or a program disc? If this is a DVD disc, try loading a music CD or other type of disc to see if it is recognized. If so, its possible your PC DVD is unable to recognize that specifc type of DVD. Try other DVD's which you know worked before using Vista. Even though your machine says the device is working properly, check the Lenovo website for updated drivers for the DVD and the board chipset. Let me know if updating the drivers does not work. Meanwhile, I'll see if I can find out any more information from Lenovo.
With help of Yamaha tech staff, I inserted a business card under disk "lid" in bottom left corner, slid card to right to release catch. With catch released, pushed disc in to insure in OK, closed lid cover, then slide card from lower right corner to left to re-catch. Read disc OK.
I have the same problem. When I insert a disk, my NAD T 550 DVD player displays 'No Disc'. It started with new disks while still reading older disks, but at some time it stopped recognizing any disk. Did you receive any suggestion yet or has anyone a suggestion?
Since you don't indicate what you mean by "won't work", let me provide a few possibilities:
1) You close the door and you can hear the DVD spin, but no reaction on the screen other than some type of "loading" message. This indicates that the optics are attempting to read the DVD but are having difficulties. The operation may ultimately be successful and the DVD may start, but the movie will be unwatchable because of freezes etc. In this case, try cleaning the lens using a cotton swab and alcohol. A dirty lens can cause this.
2) You close the lid and do not hear the DVD spin. In this case, the optics can not even determine that a disc is in the machine. Again attempt to clean the lens. If that fails to at least cause the disc to spin, the optics have failed and need to be replaced.
3) Try a music CD. If that plays OK, but a DVD does not, then the optics are defective and need to be replaced. DVDs require a more powerful laser and will typically fail sooner than CD levels.