The green power / timer light keeps flashing on model WS-73713 mitsubishi

Good chance it took out the str regulator in the power supply.

Common problem on some of these models...check www.TvRepairKits.com for a Mits blinking light repair kit.

My unit has blurred halo colors around screen items (people,cars, building, etc.) and when I turn to the HD channels this seems to dissipate a little.

Bad STK ICS

the capacitors on the DM need to be replaced. Very easy repair you can get the repair kit at this link which is for your model it contains the replacement capacitors and step by step insturctions.
http://servicemanuals.vstore.ca/product_info.php/pName/v21v19-mitsubishi-dm-repair-kit/cName/repair-kits

could be a lot of things really. when you replace the bulb, there is a switch that will prevent the tv from turning on if the cover isn't sitting correctly, by moving it that might have shifted so it would blink, but not turn on. if not, well get it serviced, sorry

Your power board has issues, you can order one from shopjimmy or ebay

Have you tried to hit the reset button on the front of the tv?

Needs DM module repair = replace four 1000mf/25v 105 degree
caps..www.chrisandnat.com/projects/blinkingtv/blink.htm
.......................T.

My Mitsubishi WS-73713 had the same blinking green timer light problem and would not turn on. I tried the reset button and unplugging power to no avail. I found that by simultaneously holding down the remote control "power" button and "volume" button for about 30 seconds the blinking light would go out and a solid green light would come on. Even though the solid green light came on the unit would still not power up. After doing this several times however the unit did finally power up in a normal mode and appears to be working again. It's worth trying before calling in for an expensive repair. PS - From here on out I'm sticking with SONY or Toshiba sets which have given be great service.