Hello! I'm new to the forum. Hope someone can help me.

I am looking at a surround sound stereo receiver for a freind (Pioneer
RX-570). Every time i plug it in it blows a fuse inside the unit. I've
opened it up looking for any obvious signs, but nothing looks out of order
except for the blown fuse. I borrowed a multimeter and probed around a bit
looking for broken circuits or whatnot. The only thing i found that was out
of line to ME (having little experience) was that there was a brown,
cylindrical object about a quarter inch long with two red and one green line
going around it in which when probed, had no needle movement(in ohms) on the
multimeter. I have placed the probes on it different ways on either end but
no dice. I did some reading on the net about it and i believe it to be
resistor. It's my understanding that resistors resist current, but do not
block it, so i figure there should be SOME current coming through, shouldn't
there? I have no training in electronics and know very little about it, but
i'm hoping to learn. If someone replys trying to help me, please keep the
lingo simple for me. Thanks!