Yer monitor might be bad or something. I had to replace mine last month because it went off...forever.
i'ts brand new...and talie i didn't touch it... i would sit here start my computer and watch the monitor turn itself off....as for a warrnety yes i have that i have a replacement warrenty for everything my system came with for a year. i just wanted to see if maybe it was something in the setup or if there was something in the configurations that i could fix....