Sound & brightness not working properly & features often very slow

I have a new imac.
Just trying to hit the "about this Mac" took 4 tries before it displayed, anyway its a OS X version 10.9.1 / 3.4GHz i5 8GB.
So the main issue is when I try increasing /decreasing volume or brightness with bluetooth keyboard it seems to have a lag or delay, and often does not adjust at all. At first I thought this was the only issue but now it seems the lag is effecting many areas.
even trying to open "force quit" results in the beach ball appearing and takes about a minute before the force quit actually appears.
I have 2 other macs and I have never had this issue before.
Now the sound is not on at all lol, any help appreciated!

Hey Movitar,
I understand that you're experiencing several issues across your iMac. I would start off your troubleshooting with these steps:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosingSleep. Wake the computer after it has gone to sleep.
Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
If your Mac appears to be running normally but isn't responding, force the computer to shut down by pressing and holding the power button for 10 seconds. Note: You will lose any unsaved work in any open applications.For Mac portables experiencing issues related to the MagSafe power adapter and/or battery, try:
Unplug the MagSafe power adapter from the Mac and the wall power socket for several seconds.
Shutdown the Mac. Physically remove and re-insert the battery (if it's removable) and startup the Mac.
If the issue is still not resolved after following the troubleshooting items above, an SMC reset may be necessary.After performing normal troubleshooting, these symptoms may indicate that an SMC reset may be necessary:
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Note: For Intel-based Xserve computers that are not responding, you can shut down locally, or by using remote commands, or by pressing and holding the power button for five seconds.
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Have a great day,
Delgadoh

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