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rhames
Jun 27, 2013

How to reset PRAM on an iMac?

How do I reset the PRAM on a iMac?

jimlynch
06/27/2013
About NVRAM and PRAM
http://support.apple.com/kb/HT1379?viewlocale=en_US&locale=en_US

"Your Mac stores certain settings in a special memory area even if it is turned off. On Intel-based Macs, this is stored in memory known as NVRAM; on PowerPC-based Macs, this is stored in memory known as PRAM.

Information stored in NVRAM / PRAM includes:

Speaker volume
Screen resolution
Startup disk selection
Recent kernel panic information, if any
If you experience issues related to these functions, you may need to reset the NVRAM or PRAM. For example, if your Mac starts up from a startup disk other than the one you've specified in Startup Disk preferences, or if a "question mark" icon appears briefly when your Mac starts up, resetting NVRAM / PRAM may help."
kreiley
06/27/2013

When you turn it on, immediately press Option+Command+P+R and hold it down until it resets and you hear it make the startup chime three times. I’ve rarely seen it resolve anything, but what the heck, it’s free and you might get lucky.

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