Unfortunately the only reason I opened the case was to install a fan... and in the process of hooking up that fan I blew the fan and the fuses in quite a spectacular way.

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Um, how did you plan to adjust the voltages if not by opening the case?

So, did you manage to install the fan? Or will you be seeking a replacement for round 2? What guide did you use to install the fan? Or did you just "wing" it yourself?

Did you test your +12-V supply to make sure it was optimal before adding the additional load? The fan specs should be approx. 0.9 W @ +12 V DC (+/-15%)/120mA. You splice it into the J4 connector. Red to yellow (pin 10), black to violet (pin 7).