sometimes not every time i get online my computer will for no reason shutdown completely.the screen goes black with a blue box that says dpms shutdown mode.then it shut down completely.i have a hp with windows xp.i have checked my bios and there is nothing there about it,and i have checked my power management and hibernate is off nothing is set to shut cp down. please can somebody tell me what is doing this thank you!

dpms shutdown
Crane101