PA28 PLT TAXIED WITHOUT CLRNC. HE THEN HAD A RWY INCURSION AT CYS.

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I STARTED ENG; TURNED ON RADIOS AND TUNED IN ATIS. I TRIED TO CONTACT GND ON RADIO #1; NO RESPONSE. TRIED RADIO #2; NO RESPONSE. TUNED TO TWR FREQ. NO RESPONSE ON RADIO #1 OR #2. TAXIED TO RAMP AREA LEADING TO TXWY TO ACTIVE AND DID 2 360 DEG TURNS; TRYING TO ATTRACT ATTN TO TWR. NO REACTION. THERE WERE NO LIGHTS IN OR ON TWR; SO I THOUGHT THAT PERHAPS THE TWR HAD CLOSED. I DECIDED ANGLE WAS TOO SHARP FROM PRESENT LOCATION TO TWR; SO I CROSSED RWY 12/30 AND TAXIED OUT TOWARDS DIRECTION OF RWY 26. AGAIN I DID A 360 DEG TURN AND FLASHED MY LNDG LIGHT AT TWR. THEY FINALLY ACKNOWLEDGED MY PRESENCE; BUT STATED OVER RADIO TO RETURN TO FBO. I COULD HEAR THEN; BUT THEY COULD NOT HEAR ME. WHILE TAXIING BACK; THEY SAID IF I HAD A CELL PHONE TO CALL THEM. I DID. I TOLD THEM I COULD HEAR; BUT FOR SOME REASON; THEY COULDN'T HEAR ME. I ASKED FOR NORDO TKOF. THEY AGREED AND SENT ME TO RWY 30. WHILE TAXIING THERE; I NOTICED A WIRE TO INTERCOM HAD PULLED LOOSE. I RECONNECTED AND 2-WAY COM WAS ESTABLISHED. FLEW HOME UNEVENTFULLY. BIGGEST PROB WAS THERE WAS NO WAY OR PLACE FOR ME TO TAXI TO AND GET THEIR ATTN EXCEPT BY XING RWY 12/30. IF ARPT HAD BEEN BUSIER; PERHAPS THEY WOULD'VE BEEN PAYING MORE ATTN TO GND MOVEMENT. I WOULD HAVE CALLED TWR ON CELL PHONE; PRIOR TO XING RWY 12/30; BUT THAT NUMBER WAS NOT LISTED IN AFD OR IN COMMERCIAL BOOK.