I have a philips hts6510 home theatre system and when i put a dvd in to play it says no disc

You can check on this for more solutions and details:
How to fix a DVD "No disc" error (3 solutions)

If you can't solve this, you can also download a free Blu-ray player program which can be an alternative to it, such as Leawo Blu-ray Player

Hi,
Normally a dvd player shows the message NO DISC when,
1. The disc inserted is bad.
2 The lase pickup unit inside the dvd lost its reading intensity, dirty lens or the spindle motor damaged .

In your case the second one happened. the intensity of the laser pickup unit has lost or the spindle motor faulty or there is some dust on its lens. just insert a cleaning cd in it for two or three times. then check again is the DVD is reading or not

if the problem remains then you have to check the motor and the laser pickup unit. the lase pickup unit have two laser emitter and receiver in its inside . one for reading and playing DVDs and the other for CD and MP3. also the spindle motor runs in different speed when u insert dvd and cd.

Open the cover of your dvd player and power it on insert an audio cd and watch is it reading or not also notice the speed of the spindling of the cd. if the audio cd reads and play. then the possible problem is the spindle motor

To conform it remove the audio cd and insert a dvd. watch the rotation of the dvd. if it feel very hard to rotate it then, the spindle motor is damaged. if so replace the spindle motor if it runs more the the speed of than audio cd then the laser pickup unit is faulty. Then u have to replace the laser pickup unit.
if you need any further assistance from me , feel free to contact me through fixya.
ok