Can't connect to PfSense GUI

[gunnerrrrrrr]

I cannot connect to my pfsense gui (10.0.0.1) but CAN connect to my routers gui (normally, it's the other way around) so yes, it's been working fine for a few months now. I tried different browsers, but all send me to a white screen. Seems like it loads, but its just now showing anything.

My setup:
Centurylink modem/router runs a wired connection to my Linksys router. Linksys router is plugged into the an old PC that I installed pfsense on, runs through there, then back to Linksys router to send out wifi.

No clue what happened, any leads?