Ok folks this one has me baffled and I could use some help. I have a Pinnacle PC TV Studio card in my PC that I want to hook up to cable. I have the cable split by a splitter with one end running to my home entertainment center where my regular TV is at and another running (not connected now though) to my PC. Yet when I try and hook it up to my PC I got this really large spark (luckily it didn't hit me) that actually burned part of the F connector on the cable. The PC is fine (thankfully) but until I figure out what's going on I'm not going to hook it up again. Even then I'll try hooking it up to an old VCR that I don't care about before the PC. The other cable run from the same splitter which has the same source does not produce any sparks. The cable is grounded as far as I can tell and the PC is grounded as well. It's hooked up to a Tripplite SMART 1400 UPS which shows as grounded on its status lights. I have even had an electrician out a while back that checked the electrical outlets and they are grounded. I've used a multi meter to check for voltage on the line but it detects nothing at all. Any ideas?