Can someone please help?

I was playing a game on my Xbox 360 S and all of a sudden it glitched and froze. I shut it off then turned it back on, and now it shows green for a few seconds, then a solid red dot of death, and doesn't even switch to the actual console, like it just stays on the blank TV screen. I notice when I pick it up there sounds like a small rattling part. I'm afraid I overheated it and it melted a part loose? I've already confirmed it isn't something with my power supply, and I also don't have a warranty, so what can I do to fix it?