MBP not sleeping under 10.5 or 10.6

[stoutdog101]

Hi all,

Ever since I reinstalled 10.5 last January, my MBP (early 2008) refuses to sleep automatically - it works fine if I direct it to sleep manually or close the lid. I had hoped that 10.6 would fix this issue, but it has not. All the settings are correct under System Preferences, so I have no clue what is going on.

Any suggestions? Thanks.

 

[GoCubsGo]

Have you tried to reset the SMC?

 

[stoutdog101]

Jessica,

Thank you. I followed Apple's instructions and nothing happened... my MBP still won't sleep. Am I supposed to notice anything different in the energy saver preferences, as all my settings were the same as before. How do I know the SMC reset actually took?

 

[SMC1991]

Jessica,

Thank you. I followed Apple's instructions and nothing happened... my MBP still won't sleep. Am I supposed to notice anything different in the energy saver preferences, as all my settings were the same as before. How do I know the SMC reset actually took?

Try unchecking the option to "Put Hard Disks to Sleep When Possible".

 

[aristobrat]

At one time (for me anyway), if Firefox was running, my system wouldn't sleep on its own. My guess is that it was one of the extensions I had loaded. The problem eventually fixed itself.

If no programs are running, will it sleep? That'd at least help isolate if it's an OS/hardware issue vs. a non-sleepy app.

 

[Graig]

I had this same problem with my iMac with 10.6.1 installed. The only way I was able to fix it was to reinstall.