IMac 2009 (21 inch) making hard drive noises during sleep mode - normal??

Hi there guys,
I have an iMac 21 inch (2009) , 3ghz C2D, 4GB Ram, 1TB hard drive (the hard drive was upgraded straight thru apple, when i bought it i paid extra for a 1tb hard drive, its not a DIY hard drive upgrade)
aniways, I recently noticed that during sleep mode, occasionally (not all the time) I can hear some faint clicking / hard drive noise, which is really weird because i put the imac in sleep mode and it really shouldnt be doing that no?
My 13 inch macbook pro 2010 never does this in sleep mode, its always dead silent
Im just wondering if this hard drive accessing / clicking noise during sleep mode is normal in imacs??

Im just wondering if this hard drive accessing / clicking noise during sleep mode is normal in imacs?
No it should not be doing anything but sleeping. The SMC controls sleep, try resetting it.
Reset the SMC
• Shut down the computer.
• Detach the computer's power cord.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Reattach the computers power cable.
• Turn on the computer.
Dah•veed

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