MBP (early 2009) won't wake from Display Sleep

My MBP has started to not wake from Display Sleep (the machine is not sleeping, only the display). The only way to get it back is to force power off by holding the power button down.
The weird thing is, when I power it on, it shows the 'loading RAM from disk' progress bar down the bottom of the all grey screen, as if the battery ran out. But I have it connected to a power source. Once it loads the RAM, the screen goes blank and it hangs. Another force restart and it boots to the login screen as per normal.
One thing I have noticed is that when this all happens (ie, when I try to wake it and nothing happens) the fans are on about medium speed and its very warm, as if there is some process thats causing high CPU usage and preventing the display waking. I usually have a few browsers open, iTunes, etc, nothing out of the ordinary.
I might try connecting via screen sharing next this happens to see if its responsive over the network -- i'll post my findings here.
I have screen saver with password protection turned on, and its connected to an external apple display.
Has anyone else experienced this?

Try a SMC reset.
DALE

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