why does my macbook pro stall every now and then for about 5 seconds when running osx

Try doing a SMC RESET.

If that doesn't work, try verify disk permissions and repair them if errors are found then restart your macbook.

Run Activity Monitor and observe what it shows when there is a stall.

Perfect.....Now you know what to do if it happens again.....

Cheers...

hello,

I am a newbie to this discussion and would like to get some help. I recently experienced the same problem as said in this thread.

My Mac is mid 2009 model with OS X 10.5.8, 4GB RAM, CPU 2.2GHz dua core)

I recently stalled up often when I had MS. word, firefox and others run at the same time. After each move (new page on firefox or typing some words) it stalled there for quite sometimes, a few second at least, and occasionally it stood till then only way to get it run again is to turn it off with the power button held down

what I did to it is:

I checked the Active monitor and found that the CPU usage and RAM were very ok (around 15% for CPU and 20% for RAM when I run severy applications) so my conclusion was: CPU and RAM were OK.

I started to deleted several applications which I rarely use, hoping that it helped. it seemed that after I did, it peformed better but still experiencing stalling for sometimes. the PROBEM did not go away

I run the solution as suggested in this thread , then it did not work . One thing I noted in the ACtive monitor was that one process called "HP product research" appeared in RED text (all other processess are normally black). I do not know what it was or

so any suggestion differently would be appreciated.

Cheers

levan