Wake up problem in SL with external display?

[Baggy Spandex]

Hello all,

Just did an upgrade from Leopard to Snow Leopard on my 09 MBP. I always use this computer in conjunction with my NEC display. On Leopard, I would keep the MBP lid closed and use the mouse or keyboard to wake it up, using only the NEC monitor. Now in SL, whenever I try to wake it up the screen flashes for a second and the computer goes back to sleep. Is there a setting or something I'm missing, or simply a bug?

Really frustrating, as it's rendering it nearly impossible to use an external display. Everything else in SL so far has been great (knock on wood)

Thanks!

 

[BigJohno]

is the power cord plugged in? I know I tried running my external with SL without the power cord and It would do the same thing. Turn on for a sec then go back to sleep.

 

[Baggy Spandex]

is the power cord plugged in? I know I tried running my external with SL without the power cord and It would do the same thing. Turn on for a sec then go back to sleep.

Thanks for the reply...power cord was plugged in the whole time. I did a resett on the SMC settings, and now it seems to be functioning properly. I'll be keeping an eye on it though.

 

[kasakka]

I had this problem when running on battery but once I connected the power cord it has worked just fine the whole day.

Is it supposed to go back to sleep if not using the power cord? I think not?