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I had the same issue. The laser would only turn on intermittently and mostly not turn on at all. Since the green led would come on for 2 seconds when you first turn the rotary laser unit on (as per the user manual) I decided that the problem was probably with the remote. I took it apart (4 screws) and cleaned the corrosion off of the battery contacts on the slider switch and the two plates that the switch sliders make contact with. I also bent the two thin slider contacts so that they would contact the corresponding plates on the circuit board with a little more pressure. Put it back together and that seemed to fix it.
First, be sure to clean the battery connection points with an electrical contact cleaner and be sure that the batteries are new, not just different. If that does not work, try placing the instrument in a freezer for at least 30 minutes. This worked with my 5 point Stanley Fat Max. The freezer will cause some condensation to form on the inside of the instrument, but why it makes the diode work is a mystery, at least to me.
I've never come across that with mine, but I have a couple thoughts that you might try ........
First, check and make sure there are no buttons stuck down. And the second thing is take the battery out for a minute or so and see if it clears it. In fact, you might also want to check the battery voltage. I suppose there's a chance that low voltage could do that??
The laser is either dirty, or out of alignment or possibly too weak to read the disc. Try one of the laser cleaning disck with an alignment check I believe that maxell sells these, if you can't find one then a repair technician can adjust or clean i, but if the laser is no good then it will need replaced. Might be better to replace the unit before having a tech work on it or your costs will exceed a new unit.
Most likely the DVD laser lens is dirty. Unplug the CH-DVD 300 from the wall outlet, wait 5 minutes, then remove the top cover. Next, remove the rectangular metal plate which covers the area where the CD or DVD disc would be when in the player's tray. Underneath the rectangular plate you should see two small lenses. Gently clean these lenses using ear swabs moistened with isopropyl alcohol. Reassemble the CH-DVD 300 in the reverse order that you disassembled it, plug it back into power, and now it should read your DVD discs just fine.