B737 FLT HAS A MALFUNCTION WITH THE FMC AND ELECTRONIC FLT INFO SYS; AND AFTER DISCUSSION WITH COMPANY; ELECTS TO RETURN TO THE DEP ARPT OF GEG.

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ON THE GND IN GEG WE WERE UNABLE TO COMPLETE INIT OF FMC DUE TO POS INIT PAGE NOT SHOWING BOX FOR ZFW; AS WELL AS GW AND FUEL BOXES BEING BLANK. ALSO; CAPT'S LOC AND VOR FLAGS DISPLAYS ON ADI/HSI. MAINT RERACKED RADIOS AND DEPWRED/REPWRED ACFT AND ALL SYS RETURNED TO NORMAL. ON CLBOUT FROM GEG; NOTICED LOC AGAIN DISPLAYED ON ADI AND SHORTLY THEREAFTER; VOR DISPLAYED ON HSI. CHKED FMC AND PREVIOUS ERRORS WERE BACK ON P OS INIT PAGE. CALLED DISPATCH; TOLD THEM WHAT WE HAD; AND THEY BROUGHT MAINT CTL INTO PATCH. HAD US RESET VOR/ILS CIRCUIT BREAKER; BUT NO HELP. ALTHOUGH MAINT CTL WAS PUSHING US TO GO TO DEN; I DECIDED THAT A RETURN TO GEG WAS THE MOST PRUDENT/SAFEST COURSE OF ACTION AS WE WERE NOW DOWN TO #1 VOR (THE FO'S) AS MY VOR AND THE FMC WERE BOTH INOP. THE DISPATCHER AGREED; AND WE AMENDED THE RELEASE; AND TURNED BACK TO GEG. BY THIS TIME; WE WERE APPROX 125 MI OUT FROM GEG. THEN ON DSCNT INTO GEG; WHILE TALKING TO GEG APCH; WE LOST THE #2 VOR ALSO. I DID NOT DECLARE AN EMER AS WE WERE VFR WITH FIELD IN SIGHT BY THIS TIME; AND UNDER ATC RADAR VECTORS FOR VISUAL APCH (GOOD VFR WX IN GEG). LANDED WITHOUT INCIDENT; WITH #2 ILS WORKING FINE; BUT #1 INOP.