My 50 inch Hitachi plasma 1080 tv has a blinking blue light and screen is blank when powered on.

Unfortunately, this indicates a technical fault with the TV which can only be fixed by a service engineer.
If the light is blue and blinks 3 times, it is indicating a fault with one (or both) of 2 circuit boards inside. They are the XSUS or YSUS boards and will possibly need replacing.
At least knowing this might help you ascertain a quote as too how much the repair will cost.

Power supply board is dead.Replaced the power supply board,Ur tv will get the power back.Tries Shopjimmy.com,Ebay.com to buy a refurbish power supply board for replacement.

turn tv on and screen does not come on power blue light blinks three times.

Tries unplug,replug about 1 hour later,if doesn't work,than Ur main video backlight board it dead,must replaced.

I would say you are lucky to get a pretty fair price, sounds like a convergence problem- if the tv is a projection wide screen. worth the investment Julio [email protected]

Ur power board inverter is dead.
U need a new board.

unplug unit for 1 minute turn off main power button plug in then press main power button and try!

Does anyone know how to fix this very common Hitachi problem without paying a repair man? And if you did pay a repair man did they fix the problem, and how much was it? I absolutely LOVED this TV before this happened. :(

I am having the same problem, what was the solution to this problem? And how much did it cost to fix it?

Press the reset button...it's on the bottom to the right (underneath the TV). Same thing happened to me.