Temp light flashes tried unplugging it for a few minutes turned it on tries to power up but then power , lamp , temp lights flash for a few seconds then it shuts down and temp light stays on

Two thoughts:

First is this is a DLP set and the lamp may have failed

Second is it should have the self check which reads error codes---most of these sets that is the same:

" After you turn on the set, and get the regular red blinky lights, hold down the Device and Menu buttons together for about 5 seconds.
(then release both)

The Power light will start to flash in a two digit sequence.
For example, 3 flashes, then 7 flashes = 37.
Here are the error codes, and the corresponding problem:
12 = No error detected, check power supply.
32 = Lamp Cover is open.
33 = Air filter cover is open.
34 = Lamp abnormality
36 = Light Engine (DMD or Lamp Fan stopped)
37 = Exhaust or Lamp Ballast Fan stopped
38 = Lamp Temperature High
39 = DMD Temperature High
41 = Short is detected
44 = DVI cable between FMT and Engine disconnected
This is for a earlier Mitsubishi DLP but should be the same as your set as Mitsubishi rarely changes things like this.
If you get the lamp abnormal it is likely your problem.

Possible lamp failure but lamp light not status should blink-I have suggestions but want you to try the self check first--if set has been unplugged plug it up and turn on and when it fails:

Mitsubishi TVtroubleshooting
Here's something that might also be useful. After you turn on the set, and getthe regular red blinky lights, hold down the Device and Menu buttons togetherfor about 5 seconds.
The Power light will start to flash in a two digit sequence.
For example, 3 flashes, then 7 flashes = 37.
Here are the error codes, and the corresponding problem:
12 = No error detected, check power supply.
32 = Lamp Cover is open.
33 = Air filtercover is open.
34 = Lamp abnormality
36 = Light Engine (DMD or Lamp Fan stopped)
37 = Exhaust or Lamp Ballast Fan stopped
38 = Lamp Temperature High
39 = DMD Temperature High
41 = Short is detected
44 = DVI cablebetween FMT and Engine disconnected

A continuous flashing red light with the word LAMP on it would definitely mean you're going to need to spend a few bucks on a new lamp....or for a few more, upgrade to a TV from this century that doesn't require lamp changes :)

replaced the lamp

The lamp light does not have to flash on this set for it to be the lamp, and most likely it is just that, the lamp. These sets when the lamps get weak they will do exactly what yours is doing.

first step to take:
refer to the user's manual to find: How to replace the lamp?
and second replace the lamp. www.andrewselectronics.com. prefer original ones.

CHECK THE FUSES

You need to get the ballast repair kit #LSUC0002 and replace the parts to your ballast.

I have the exact same TV, did the above this past weekend, and the TV works like new.

You need to know how to solder though. It's not that hard.

I have the same problem. The only way to get the TV to come on is to unplug it, but once you get it back on it turns itself off again in a few minutes.

Purchased our76C in Jan, 2007. It is our second unit now that has had the same symptoms. When the unit starts up, the Power light is steady green as normal for a few minutes, but no image is projected. After a few minutes the lights do as you described. Both times Epson support authorized a new unit to be shipped out immediately. They said they had no known issues about it and didn't indicate what was causing the problem. Apparently it is not just the lamp wither. Also, the lamps both had under 20 hours on them.