On a unit I checked with this same symptom, removing the top cover allows the unit to stay on and operate normally. There is some sort of sensor at the left middle of the chassis, which, when unblocked by any opaque object, allows the unit to remain on. A temporary fix (not advisable) would be to replace the top cover with a piece of clear plastic or taut saran wrap (no vent holes needed). It's unclear exactly where/what that sensor is from a cursory test. This is a work in progress on someone else's machine that I lack full access to.
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I try to record my old vcr movies to dvd and it will go for a few seconds then quit it will say this is not a recordable disc
We have the same problem with the dvd player, it plays for about 20 seconds then shuts the entire unit off.
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