CPU Fan Suspected Problem

Stopping the fan like that would have probably caused the CPU to overheat pretty quickly, providing you were doing something intensive at the time.
Although, even at idle, a heatsink without a fan is going to get darn hot pretty quickly.

With that said, I doubt it caused any permanent damage. If it got too hot the CPU would have automatically shut its self down or began throttling.

You didn't specify if you broke the fan blade touching it, or if it was broken before hand. Either way if you're doing that much of an overclock a fan without a blade is not good at all, and, it's most likely where the noise is coming from.

Which cooler do you have? On any processor that's quite a significant overclock, you'll need a good cooler to dispell all that heat and even with the best of coolers, one blade missing could rocket temps up by quite a bit. You also lose any static pressure you may have had (depending on the fan).
You may have also damaged the bearing by stopping it so suddenly. That could also be where the noise is coming from.


Solution is to buy a replacement fan, for heatsinks I recommend the NF-F12 from Noctua.

Hooolyyyy balls dude, a 4.6GHz overclock on the stock AMD cooler?
With a broken fan blade on the already tiny fan that comes with?

That thing must be roasting its poor copper legs off. Yes, buy an after market cooler immediately, preferably also underclock your CPU back to stock or below in the mean time.

As far as coolers go, if you're wishing to achieve a 4.6GHz overclock I'd go with something a bit more substantial than a H60, the H60 is a bit like the Hyper 212 performance wise (although, being liquid there's quite a mark up). Good for stock speeds and relatively mild overclocks. It's a rather good cooler for silence optimised PCs as it offers a lot of flexibility in the fan department. It also looks pretty sweet.
With that said I wouldn't recommend it for a 4.6GHz overclock on an AMD chip, I'm going to jump to conclusion here and guess that you have the FX-8350? Since you stated a base-clock of 4.2GHz are you referring to the max 'Turbo' speed of that processor? (The stock clock is 4.00GHz).

I used to own the H60 on my 8350 a few months ago and it did a great job of being silent and looking great at stock speeds as I said, it would probably manage a mild overclock on a lesser TDP processor, such as one of Intels 70-odd watt range, but I doubt it would go for anything more than .2GHz on the 8350, especially with its starting TDP of 125w. Even that is pushing it a little.

Since I had the pleasure of using one, and now have the H80i, I always tell people from here on out to look at the H80i instead. Not only is it a far more capable cooler, with some nice extra features to boot, but, it's also only around 5-10£ more expensive than the H60. With a near twice as thick radiator, features on the block such as multi-coloured LED for the Corsair logo, fan slots (By means of a Y-cable) and integration with Corsair Link (Optional), and... slightly shinier tubing, if that helps - it's an all-round better cooler.

It does however, come at a premium, as do all AIO liquid CPU coolers, you can get equivalent performance or better on 'air' for the same price or less. It will be up to you decide the pro's and con's of each.

In conclusion then:
Definitely revert your clock speeds back. I mean, duuude, open up a temp monitoring program and run a stress test and I'll be willing to bet that thing gets mighty toasty. Dangerously so.

Look in to buying a greater after market cooler. I'm not much of the expert on the air cooler market, or even the AIO outside of Corsairs line, but some great coolers to list:

Noctua NH-D14 (Or the latest 15 version if you can find it).
Corsair H80i or H100i or H105 (Check for case compatibility).
Cooler Master Hyper 212 EVO (For mild overclocks on that processor).

Also try to improve your case airflow if you say you need to point a fan at it.

Unfortunately it features the same radiator and basically all round similar performance. The H75 is pretty much the H60 with a slightly different block and it comes with two fans for a push/pull setup.

You will get slightly better temps with the two fans (You can also buy a second fan separately and attach it to the H60) but overall the radiator is so thin that most fans with a commendable static pressure level will be able to drag the heat away just fine.

Incidentally, the newer block on the H75 is also slightly more difficult to install on an AMD board. With the original block design it was and is just a matter of attaching two clips and tightening two screws. With the newer version, you actually have to remove the standard AMD backplate and replace it with the one that comes with the H75.
Quite an annoying task for the same/similar performance.