Check all of your connectors first. I have seen everything from a molex to a SATA connector over heat and melt. Check every place that a device plugs into some sort of power connector.
This includes checking your power switch on your front panel. You may have to remove the panel to get a good look but i have seen PC cases short out here on more than one occasion.
I would not suggest blindly replacing hardware because that can get costly. With that being said there is noting wrong with pulling out the parts and giving them a close inspection (and a good sniff for that ominous burnt smell) to see if anything is starting to have issues.
This is just a quick list off the top of my head so I'm sure others will have ideas to add to your solution.
Yeah, I think you're right. I just don't feel like pulling everything apart. I looked for melted wires, but didn't see any. I haven't touched anything in a couple months though. Last thing I did was add a big fan to my CPU cus that was getting a little hot at times. The big fan fixed that and seems to be working well. The CPU is always at a decent temp now.