Remove the disc from the DVD player. Use a lint-free cloth and some denatured alcohol or water to clean the disc and remove any dust or smudges that may prevent the player from reading it properly.
Reinsert the disc into the player and press "Play" to see if cleaning the disc fixes the "NO DISC" error.
I m dvd home cinema sound system ht q20 every thing is ok but soung is not good plz hlep me
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