Can a room be too cold to operate an iMac?

I have my iMac in a room where I have the heat turned off to save on heating bill. When I turn on the computer the past couple of days, my modem flashes as if the computer is going on, but the computer screen remains black. The room temp is 55 degrees. If I turn the heat on and let it get to 59, it does come on. I don't know if it is coming on because I've turned the heat up or if it just came up by itself. Is there a minimum room temperature for operation?

I don't know what model iMac you have, but the tech specs page for the current iMac
http://support.apple.com/kb/SP576
says, "Operating temperature: 50° to 95° F (10° to 35° C)"
If you are having issues with startup, you should try resetting PRAM
http://support.apple.com/kb/HT1379
and then opening System Preferences +Startup Disk+ pane to make sure your internal drive is selected (highlighted) as the startup disk. If that does not help, you can also try resetting SMC
http://support.apple.com/kb/HT3964
which is unplugging your iMac from power and reconnecting, using a precise procedure.

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