Mac Mini Reboot Hang

I’m writing this post because I am experiencing an intermittent hang on boot on my Late 2009 MacMini. The specs are:
Processor: 2.25 GHz
Memory: 2 GB
Graphics: NVIDIA GeForce 9400 256 MB
Software: OS X 10.8.5 (12F45)
More times than not, when I reboot the computer, I get a grey screen that hangs the boot until I do a hard restart (holding down the power button until the computer shuts down, waiting a minute, and then hitting the button again to restart the computer).
I have narrowed down the problem in the system.log to the following lines. Each time I have this hang, this is where the log ends before the hard restart is represented. However, I don’t understand what these lines mean and what problem they represent:
Jan 10 17:07:24 localhost com.apple.usbmuxd[29]: usbmuxd-323.1 on Oct 3 2013 at 12:43:24, running 64 bit
Jan 10 17:08:09 localhost configd[18]: InterfaceNamer: timed out waiting for IOKit to quiesce
Jan 10 17:08:09 localhost configd[18]: Busy services :
Jan 10 17:08:09 localhost configd[18]: Macmini3,1 [1, 73889 ms]
I have tried the following remedies to fix this problem:
Full drive reformat and clean reinstall of the system software.
Disconnecting any external drives attached via USB.
If someone could give me an idea of what kind of problem I’m facing and any possible remedies I would very much appreciate it. Thanks!

Step 1
Disconnect all wired peripherals except those needed to boot, and remove anything that's inserted in the card-reader slot, if your model has one, including an empty adapter.
Step 2
Reset the System Management Controller.
Step 3
Boot in safe mode. This will cause certain caches maintained by the system to be rebuilt.
Safe mode is much slower to boot than normal.
When the login screen appears, reboot as usual (not in safe mode) and test. There's no need to log in while in safe mode.
Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. In that case, ask for instructions.

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