Why Wont my mac Mini Shut Down After SSD Install?

Question

Heres the Gist,
I have a late 2009 Mac Mini (A1283) 2.53 GHz, 4gig ram.  that i've been running as a media server.  Recently the harddrive died in it. I decided to install a Intel 320 Series GEN3 SSD Drive.  The install went fine and clean, Mac booted up perfectly, installed a new version of OSX 10.6, no issues, did all the updates. The only software I installed was Plex Media Server (http://www.plexapp.com/)  and Google Chrome.
Now my issue is, when i go to shut the Mac Mini down, all that happens is the dock disappears and all the desktop icons then it just sits there, nothing happens.  I reset the PMU and it still does the same thing, except now the fan is on high all the time.
Other things i've tried:
Verifiying and Repairing the Disc Permissions
Verifiying and Repairing the Disc
Closing all apps before shut down
disconnecting all network drives and external drives before shut down
reseting the PMU
When I get home im going to try:
Resetting the SMU.
Running YASU (Although its a fresh install with no apps so not to sure what it will find)
Im looking for any and all other suggestions to try.  I was considering upgrading to 10.7 to see if its just a software glitch, but im not to sure why this would be happening now.
thanks for any and all advice in advance

Answer 1

It's SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
Plus the PRAM > Resetting your Mac's PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.