I'm not trying to be flippant, but your best bet is to call a TV technician. There's too may possible causes for the problem as you describe.
hitachi tv has sound no picture
Yes, it makes the picture clearer
It is truly your opinion if you want HD projection with your TV or not. If you hate fuzzy pictures on your television and have the money to buy the TV, you might get HD projection but if you are happy with just a regular picture than you have no need for the HD TV.
Picture bowing and bending on a projection TV is usually caused by an out-of-spec power supply voltage that is not providing sufficient voltage for proper screen deflection. Seek qualified service for this unit.
Have you tried adjusting the settings on your tv like the contrast/tint/etc.? It might be a bad picture tube in which case you may need to get a new tv but without more details it's hard to know for sure what's going on.
the outage probably drained your projection tv out of power, sometimes, it happens, sorry to hear that, projection tv's are rare these days, Happy Christmas!
The CRT refers to cathode ray tube. This is the oldest of the varous TV types. More recent developments have been projection, plasma, etc.
Sounds like your projection tubes are getting weak, and need to heat up for awhile before they're running at their optimum, considering their age.
The projection lamp, from the sound of things.
Usually less than $100
The old school box projection tv need three picture tubes ranging around $200 a piece. Cheaper to buy a new tv.
Call an engineer