HCL Me Tablet — HCL PLASMA stops showing display after few minutes.

Address:

Lucknow, Uttar Pradesh

My HCL plasma (monitor) of my desktop computer stops showing display after few min means it get black on screen but when I switch of the monitor button and switch on then it shows the screen. When my monitor gets black the programs are running easily, there is no disturbances in running programs, to quit the program I have to switch of and on my PC.
So please repair my plasma ................................its very urgent.