Going by your description of what you did it sounds like you didn't follow the correct way to overclock. Overclocking is done at a very slow and tedious pace with the smallest iincrements of voltage and multiplier raised. Situations like this are exactly why that is the way to do it because it sounds like you just put in 1.3v and 4.8ghz and tried to see if your computer would run at that.
If you had done it the correct way you would have gotten warning signs that you were going too high and you could have backed off.
You can't overclock Ivy Bridge to 4.8 ghz on air , Ivy Bridge is not a very good cpu to be overclocked , it's a low voltage cpu and as such does not like voltage to be added in overclocking at the higher speeds. To save yourself some more damage to your cpu read the article below.http://www.tomshardware.com/reviews/ivy-bridge-overclocking-core-i7-3770k,3198.html