Dvd always says no disc

There are several possible reasons why your DVD player is not playing movies, but is playing CDs. Here are some steps you can take to try to fix the issue:

1. Clean the disc: Sometimes, a dirty or scratched disc can cause the "no disc" error message. Try cleaning the disc with a soft, lint-free cloth, wiping from the center outwards. Avoid using harsh chemicals or abrasives.
2. Clean the DVD player: A dirty lens or other components in the DVD player can also cause problems with reading discs. Try using a DVD lens cleaning kit to clean the lens, or open up the DVD player and carefully clean any visible dust or debris.
3. Check the disc format: Make sure that the movies you are trying to play are in a format that is compatible with your DVD player. Some players may not support certain file types, such as Blu-ray discs or region-specific DVDs.
4. Check the connections: Make sure that all cables and connections are securely plugged in and functioning properly. Try using a different cable or port if possible.
5. Reset the DVD player: Some DVD players have a reset button or option in the settings menu. Try resetting the player to its default settings and see if that resolves the issue.

If none of these steps work, it's possible that there may be a hardware issue with your DVD player, such as a malfunctioning laser or drive motor. In that case, it may be necessary to take the player to a repair shop or consider purchasing a new one.

This problem is normal and exists with many CD/DVD drives.
On some of the drives, if you put in blank discs and try to open the disc in My Computer or Windows Explorer, Windows displays no contents or a blank disc. Whereas on other drives, you get the error message that you mentioned about incorrect function.

What software are you using to burn CDs or DVDs? Are you able to burn CDs but not DVDs or you can't burn both the discs? Did you try a CDs with a different make/manufacturer? Some drives refuse on some disc makes. Try another disc and another writing speed, or try the lowest writing speed available with your software.

Hope that helps,
Regards,
Raspal

1st of all which burning software you are using ?2ndly burn the disc @ lowest speed
might help you

Try to put your laptop always on flat surface. Uneven base gives angle to the already tiny clearance space for the disc. Could be that the DVD disc run coz its finer, it will spin much slower than CD disc.

Hope i give you some good observation.

Forbes,
I think you have taken on a great task. There are many steps to setting up the lasers before auto align can work. There are manual settings which need to be done. The manual will be helpful, however there is a knowledge of how to do the initial settings needed in order to get the unit just to recognize there is a disk waiting to be played. That happens in what is the initializing stage. If the settings are incorrect the unit won't even see a disc. I used to own a service center that was authorized by over 70 manufacturers. Laser replacement was never a swap and play thing. Alignment was always critical. And one more thing you should know. If the laser is too hot after you get it playing it will go bad quickly. You need a meter to check that as well. God luck Rob 

Laser got weak. buy a new one

Here are a couple solutions:

How To Recalibrate DVD Player

Summary:

For those that are having the skiping up and unreadable disk problems try the following calabration. I did it last night and now my DVD's are much clearer and I'm hoping the skiping problem is gone.

For those that have the lip sync problem Sony should cover this for no charge, you just need to push them a little. This is a firmware update, have a look at the other posts at this web site to find the firmware revision that you need.

HOW TO PERFORM THE CALIBRATION
Make sure that the DVD player is turned OFF and in the stand-by mode with the little red LED glowing above the on/off button.
To enter the service mode/test mode, press Title, Clear, and Power on the remote.
This will produce the following menu:
Test Mode Menu
0. Syscon Diagnosis
1. Drive Auto Adjustment
2. Drive Manual Operation
3. Mecha Aging
4. Emergency History
5. Version Information
6. Video Level Adjustment

Exit: POWER Key
What each item does;
Syscon Diagnosis = Leave this for service technicians.
Drive Auto Adjustment = Automatically calibrates DVDs and CDs.
Drive Manual Operation = Manually calibrates DVDs and CDs with prompts for permission to skip, execute and/or proceed after each adjustment is made or skipped. Offers a fascinating look at all of the many adjustments made, but this method is time consuming.
Mecha Aging = Allows auto repeat mode for testing purposes.
Emergency History = Shows the number of hours on your machine.
Version Information = Shows firmware version.
Video Level Adjustment = Test pattern.
Press #1 (Drive Auto Adjustment) on the remote and the following menu will appear:
Drive Auto Adjustment
0. All
1. DVD-SL
2. CD
3. DVD-DL
4. SACD

Exit: RETURN
Press #1 (DVD-SL) on the remote and insert a Single Layer DVD when the drawer opens.
Even though you may be interested in calibrating only a dual-layer DVD, do not skip the single-layer calibration procedure. For some reason, the player prefers to first calibrate a single-layer DVD before proceeding to a dual-layer disc. Error messages may result if the single-layer calibration procedure is not performed first.
Press the enter key and the machine will begin to calibrate all of the playback features. When calibration is completed, follow the onscreen instructions to return to the above menu.
When the Drive Auto Adjustment menu returns, press #3 (DVD-DL) on the remote and insert a Dual Layer DVD when the drawer opens. Follow the instructions as noted above.
When calibration is completed, follow the onscreen instructions to exit from the Test Mode Menu. Now you can turn the player back on and try your dual layer discs to see if the layer change has improved.
If you have any concerns about trying this service mode calibration, leave it for an authorized service facility
Other solutions:

1. To reach this test menu on a DAV-S300, press and hold the "STOP" and "Muting" button on your DVD Player (not remote) and turn the volume nob clockwise about 180 degrees. You will see a flicker. A blue test screen will appear, allowing you to calibrate your DVD. Please note that if you have no technical experience, messing around in this menu can cause serious damage to your DVD. The calibration option will be under: option 1, Disc Drive Auto Adjustment (or words to that effect). Be sure to calibrate a single-layer disc first, then dual layer -- you need to calibrate both types. Good luck.


In order for the STOP + MUTE + VOLUME sequence to work, your player must be ON, but have no disc present. You need to empty the tray, power off the S300 and power it back on. Wait until the INSERT DISC/NO DISC prompt appears. Then try the SMV sequence. And you must use the buttons on the unit, NOT on the remote, to enter the service menu. Once in the menu, use your remote to select the auto calibration menu and go from there.


2. This will fix the C 13:00 problem on any Sony DVD player.
With the machine turned off on standby, press the following 3 buttons
on the handset, in order: TITLE CLEAR POWER. The Diagnostic Start menu will come up on the TV. Select the appropriate button number for "auto adjust". The
machine basically does it all. It asks you to select either a single
layer or double layer disc (whatever your offending disc is.) Ejects
the tray, asks you to put your disc in and then calibrates it. (It's
over in about half a second... painless) Just follow the prompts on the screen

your DVDneeds to be adjusted take out the tray turn over the lens there are two shiney screws to the bottom of the lens the one to the right is for dvd and the one to the left is for cd turn to adjust. good luck.

I had the same problem, don't try to hard it won't solve the problem. Just buy a new cheap one and it even will read more formats.