iMac randomly falls asleep

[Walter541]

I have a 24inch, 3.06ghz, 4gb ram, iMac running snow leopard. It falls asleep every time I use it even when im just surfing the web. I have reformatted the drive, and used techtool pro to see if anything is wrong (it passed all the tests)but it continues to fall asleep. Could this be the ram? Any help is appreciated.
Thanks.

[666sheep]

Try SMC reset.

[Walter541]

Thanks, but no luck still falling asleep

[666sheep]

Run Hardware Test and check similar thread: http://forums.macrumors.com/showthread.php?p=9894732&posted=1#post9894732

[Walter541]

Looks like its the same problem from the other thread. I got the same error code. Is this an easy fix? is it expensive?

[apparatchik]

It maybe suffering from narcolepsy (http://en.wikipedia.org/wiki/Narcolepsy) :D

hope you can get it resolved :)

[Cave Man]

Sounds like a case of sleep macnia.