i did the same as others, just bought two 8 ft cables online, i think i paid maybe $4 a piece and they work just fine.
a couple questions, 1st do you have any other devices connected via hdmi to your tv, like your cable box or maybe a dvd player? do they work? with what cable?
2nd, any friends got an hdtv that you can try to hook up your ps3 with your and maybe one of their hdmi cables?
if you try these things you can determine exactly which is the problem child, hopefully neither the tv or ps3 obviously. but if you have another device that works through hdmi on your tv, you know its not the tv's ports. if your ps3 works on someone else's tv with their cable and not yours, you'll know it's just crap cables, but if it works on their tv with your cable then then sharp has bad ports, but if it doesn't work on another tv with a different cable, then it's the PS3... anyways, like i said hopefully just bad cables. good luck!
