點解DVD+RW碟 錄影洗咗後不能重錄？

If "No Disc" shown,may be your disc is not clean.Please clean with soft dry cloth as suggested in your user's manual.
It pays to buy brand name quality disc which is more resistant to scratches.I find HP brand DVD+RW Ok,so are Kodak,Sony.
I used to have tons of problems with Philips 890 model DVD recorder which I finally threw out.

Check if the disc is dirty or with a lot of scratches, or the lens of the player is too dirty. These two reasons may make your player unable to read the disc. You may also try a new disc to see if the problem is on the player or the disc.

If you have done all of the above and the player still does not read, repair is the only way.