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The first generation mitsubishi V26 chassis which is what your model is has a bad habit of failing capacitors. The steady blinking green power light is related to the DM not completeing the boot up sequence. You can get the V26 DM repair kit at the following link which contains the replacemnent caps that are prone to fail and has the CD with step by step instructions on how to duisassemble the cjassis and replace the caps. Its very inexspensive and will usually repair that issue. Its listed under the repair kit category. http://servicemanuals.vstore.ca/
If the green front panel LED blinks continuously and the TV never comes on, its an issue with the "DM" board. When these TVs are first plugged in, the green LED should blink for 30 sec. to a minute or so. This is the TV booting up, reading its software. Mitsubishi has been having problems with this circuit for several years. In may cases the only permanent solution is to have the chassis rebuilt by Mitsubishi at considerable cost and inconvience. The chassis may have to be sent back to Mits for this rebuild. Call Mits and ask for help.
this means the DM board is not booting up. You will typically need 4-8 capacitors to fix this issue. you have to pull out the board and solder in new parts. let me know if you feel skilled enough to do this and I can give directions. The caps will usually bulge at the tops and are 1000uf .. mitsubishi recommends replacing with 680uf 16v caps..
The problem with your set is 4 capacitors are bad on the "DM: board in the unit. These capacitors are 1000 microfarad at 16 volts. Unless you are experienced, this repair should be done by a qualified tech due to the complexity of getting to the capacitors
There are (4) 1000uf @35V capacitors all together on the DM board that need to be replaced some models have 1000uf @ 16V but they are all right beside each other and all rated at 1000ufs the voltages will be stamped on the capacitor along with the uf ratings.