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Sounds like the DMD chip is on it's way out.
Check if the intermittent problem is related to the external air temperature. Try blowing cold air around the unit with a personal fan to see if it does the same thing.
Check if the air vents and filter is clean
There is an internal fuse that may have blown. I urge caution however, as this fuse does not open without a reason. It is possible that a power supply problem is preventing the unit from starting up as well. Usually though, this would show at least a standby light. Unless you have previous experience with the repair of similar units, I would not suggest any attempts now. There are potentially dangerous voltages present inside these machines.
Please update this if there are any sympoms at all when you attempt to power up the unit.
The countdown shows while the unit is going through its internal circuit testing. Usually if a problem is found, there will be indications with the standby lights and lamp/temp lights. Are there any other indications here or just the unit going into standby?
I had a similar problem, but with no lcd lights showing and the technician diagnosed as being caused by
a faulty Ballast which he said caused the bulb to fail. He didn't test
the bulb but his experience indicates that even if the bulb was not
blown it would have been stressed and it would only be a short time
before it fails completely.
When these fail there is no real reason for it it seems but it has been
suggested that a probable cause could be not cleaning the filter, at
least every six months. The result of a dirty filter would be
overheating and this could be the cause of the failure. Perhaps you will have to check the ballast for problems
I had a smililar problem after taking it apart i realised that i had screwed my mount skrews into the video main board and cracked it along with a few soldered wires, if you havent done any physical dammage to it try a firmware upgrade
It sounds as though the unit is overheating. That would explain why the fan keeps running, and once it cools down enough it starts up again. What kind of environment are you running this in? Is there a way to put it in a cooler environment? Even having an external fan blowing on the unit could help.
Honestly, unless you've got it in a very hot environment, it also sounds like a poor design for heat dissipation. Or possibly the heat sensor is bad, and shutting it down at a lower temperature than it should.