Preventing MacBook Pro from sleepting when the cover is closed

I'd like to prevent the system from sleeping when the cover is closed, at least when it is on the power supply.
Right now, it sleeps whenever the cover is closed. As a result, my nightly backup (ordinarily scheduled for the wee hours) doesn't run.
Also, I want to use the laptop at home with an external screen, keyboard and mouse, and it would be convenient to fold it up to get it out of the way when doing so.
Thanks,
-W.

' Overheating in clamshell mode is rearely an issue if you're running on the 9400M and the system- / resource-demands aren't particularly hectic. It is something one should always just keep an eye on though anyways - just to be safe, no?
' Otherwise - there is a pay-for (shareware) program you can download and install that will give you the facility you're looking for... I'm afraid I can't remember it's name right now though... Alternatively - and the solution I myself use - try downloading and using a mini-app called "InsomniaX" - for which I can't provide a link I'm afraid, but a Net-search will quickly turn up! It's freeware (donations possible but not required) and works great - a number of options available to tune it somewhat to your needs!
' This should help ya!
~Menageryl
-Jack of All Trades, Master of Some!-

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r

Thanks, you're a life saver. Here is the report:
AC Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: Yes
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 180
Display Sleep Timer (Minutes): 2
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Battery Information:
Battery Installed: Yes
First low level warning: No
Full Charge Capacity (mAh): 3004
Remaining Capacity (mAh): 2994
Amperage (mA): 0
Voltage (mV): 12385
Cycle Count: 41
AC Charger Information:
Connected: Yes
Charging: No
Hardware Configuration:
UPS Installed: No

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I've got a MBP, running 10.6, and as of a few months ago, whenever the battery gets low to just a few percent, the computer simply shuts off. It used to go to sleep, which would allow me to plug it in and restore to where I was when it went into standby. It doesn't do that now, just a hard shut down and I've lost anything that was open. Any ideas how I can correct this and get my computer to sleep instead of dying? Thank you

It's getting low but not that low,
Try this:
Note: MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SM

Preventing MacBook Pro from sleepting when the cover is closed

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