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That's a classic power supply failure. Usually, replacing the electrolytic capacitors in the power supply will be the remedy. Also, check for a blown fuse. Although, the fuse usually won't blow unless there is an internal problem.
sounds like a voltage surge has taken it out. could be a simple fix with a fuse replacement, or a more complex destruction of the mains input circuitry and overvoltage protection devices fused and copper tracks blown.
I quick examination by a technician cam suss it out for you
sounds like the power fuse may have blown, or electronic failure, overtemperature switch/fuse may have gone open circuit.
Are the air vents free of blockages etc.
Is the cover on the lamp and filter tight
I'm not where I can consult my tech notes but you can try resetting the lamp hours and the dust filter hours and can also check your lamp by removing it and looking straight into it to see if any visible cracks or bubbles are in the reflector. That would indicate a bad lamp. Oh yeah-- make sure the grill covering the dust filter is seated properly and there is a little "eye" sensor that detects whether the grill is present so make sure it is clean or it could send false signals.
try checking the fuse coming into the machine, should be near the power cord entry, unplug first! put a multimeter on ohms across the glass/ceramic fuse, should read 0.0 or 0.1 ohms. if plugged in a lotage reading (carefully!) should read 0V if the fuse is intact. full voltage on the primary side to earth/neutral only if the fuse is intact. give that a whirl, cherap fix if its only the fuse blown
open up the top case. the fuse will be on the power supply board right next to where the power cord plugs in. you'll need a continuity tester to test it. if it is blown, replace it with the exact size and type. if it is not blown, replace the power supply.