My pc suddenly going to sleep mode, what might be the problem and how can i fix it?

i'm using windows 7 ultimate x64. i have already change the options in power supply as never even in lan connection. and still i have this problem. please help, i'm very confused..My pc suddenly going to sleep mode, what might be the problem and how can i fix it?
Ok, you will have to go into windows 7 power options to fix this. Go into power options, choose the plan that you are using, click it. Click advanced settings. Scroll to sleep. Turn all of the options in sleep to %26quot;disable%26quot; %26quot;off%26quot; or %26quot;never%26quot;. If this doesn't work, it might be the actual computer. When it starts, click the required button (f11, f8, others) button to go into settings, and see if there is an auto sleep mode. If not, you might want to have it checked out, as the problem might be in the circuit board. (but I doubt it)

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