Pro Tools M Powered Error Messages

[jomeo69]

Whilest playing back 2 mono tracks through PT i recently got a rather desturbing error message which read!

'You are running out of CPU power Delete some tacks or close some RTAS pluggins'

This was a touch worying due to 3 points.

1 there were no pluggins running
2 i was only playing back 2 mono tracks
3 I have a dual 2.3ghz processor G5 with 1.5gb of ram and PT 7.3.1

Could anyone shed any light on how to stop this occuring and what consequences any chanes would cause.
Many thanks
Joe

[bradch00]

Check your hardware buffer and CPU allocation settings to make sure you haven't the buffers set too low and the CPU allocation too small. As well, make sure you are using both processors.