How to stop iMac sleeping?

I have my new OS X 10.6 iMac set in Energy Saver to "Never sleep" while I download a couple of very big apps. Unfortunately it's still sleeping!

What to do?

I had the "hard disk sleep when possible" box checked in the Energy Saver dialogue box. Would that be the problem?
LVL 24
Alan HendersonRetired marine engineerAsked:
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roylongConnect With a Mentor Commented:
That is probably the issue, disable that.  Which web browser are you using?
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dj0rbitCommented:
Yes! Change that so it never sleeps
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nwtechdeskCommented:
You might enjoy a small app called insomnia.  http://www.macupdate.com/info.php/id/22211/insomniax
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Alan HendersonRetired marine engineerAuthor Commented:
@ dj0rbit
It doesn't make sense that enabling HDD sleep should override disabling Computer sleep. I'm trying it—I'll see what happens.

@ nwtechdesk:
1. Isn't Insomniax's purpose in life to disable sleep when closing a MacBook lid?
2. Is there a danger of overheating a MacBook when doing that?

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nwtechdeskCommented:
Stuffing a macbook into a bag with it on would cause it to overheat but otherwise the air flows and the cpu stays cool.

Keep in mind that the disk sleep command applies only to the startup drive.  If you are using other drives it is possible that their own firmware controls the spin.
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roylongCommented:
You don't have a sleep set somewhere else and timed do you?  It's possible to set the computer to sleep at a certain time each day separate from energy saver - this isn't the issue is it?
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Alan HendersonRetired marine engineerAuthor Commented:
@ roylong
This is a new iMac 2 days ago. I haven't set any Sleep function up in anything that I'm aware of although I've been putting the Display to sleep with Exposé, maybe that's the problem.  it's still going to sleep with both HDD sleep and Computer sleep off.
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roylongCommented:
Are you sure it's going to sleep and not just blanking the screen (i.e. Screensaver)?
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Alan HendersonRetired marine engineerAuthor Commented:
It was stopping downloads and requiring a password/logon. I had Preferences set to not require a password.

I just noted that in the Security Preferences it was set to the default  "Log out after 30 minutes of inactivity". So would that be the problem? Is downloading a file not recognized as "activity"?

Sorry to be so dense. I'm a 20-year Windows convert. 3 days of relatively painless withdrawal so far.

:)
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Alan HendersonRetired marine engineerAuthor Commented:
Firefox.

Doesn't everybody?
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roylongCommented:
I was curious as to whether safari would behave any differently with respect to the computer thinking you were busy while downloading...
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Alan HendersonRetired marine engineerAuthor Commented:
Good point. Next time I try a big download I'll use Safari.
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