Bizzare and awful input problems

Hello all. I bought a  Mac Mini a few months ago. A month or two later, the computer started having problems. It doesn't allow any sort of input other than mouse cursor position for around ten minutes after startup. I tried to fix this problem by reinstalling the OS, but that didn't work either. It still has the same problems.
One way I can access the computer immediately after it starts up is by VNCing into it. That seems to work for input. In addition of that problem, there is also a problem with the hover action on the cursor. For example, when playing a First Person Shooter, in order to move your character's head around, you have to hold down the left mouse as well as moving the mouse. That's really the only way I can describe it.
This makes the computer pretty useless. I play a lot of games, and it also interfers with other programs.
I'm starting to think that this is a problem with the computer because, as mentioned earlier, I have completely erased the hard drive and freshly installed the OS. It still has these issues right out of the box.
So, Apple Support Community, how do I fix this? What's wrong? I'm pretty tech-savvy so feel free to explain indepth.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, you can’t boot in safe mode.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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               IP Address:  10.10.10.64
                User-Name:  XX-XX-XX-XX-52-89
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                   Handle:  0x090000A9
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    SW03#
    SW03#
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              MAC Address:  Unknown
               IP Address:  Unknown
                   Status:  Running
                   Domain:  UNKNOWN
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         Oper control dir:  both
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             Idle timeout:  N/A
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                   Handle:  0x800000AA
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           dot1x    Running
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