Not Responding Errors and Slow Computer

Two days ago I took my computer apart to clean out the dust from the fans. I put it back together and started it up to have multiple Not Responding errors with my catalyst driver, google chrome, windows media player and other programs I try to run. Also my computer is running extremely slow compared to what it was before I took it apart.

My specs follow

Asus M4A79 Deluxe
AMD Phenom II X4 940 3.0GHZ
Asus EAH4870 DK 1Gig
OCZ Reaper HPC DDR2 2gigs x2

 

Have you verified you completely seated the RAM sticks? I know it sounds like a silly question, but from my experience thats a common issue.

 

I pushed on them a little after seating them. Ill double check.

 

You should feel them click into place.

 

I haven't checked them yet but wouldn't the system not boot if they weren't seated all the way?

 

No your system would boot; say one stick was seated, the other wasn't. It would boot up normally, but take a while longer, and running yuour programs would be like having half the usual RAM.

 

Ok so I double checked my ram. Both were seated correctly but I took them out and put them back in anyway.

Im still having problems with not responding errors. Mainly with Internet Explorer now. It will run fine for a few minutes but then stop responding for about 15 seconds and then come back to normal.

One of the power blocks on the mobo next to the cpu looks as if it was burnt a little on the corner of it. Could I have a fried mobo?

 

do you have a burning smell coming from your pc?:eek
(where your burnt power block is)

 

No there is no burning smell. I don't understand why my computer is booting up and working but extremely slow and constantly freezing up. I checked the hardware monitor and my mobo temp is around 30 degrees celcius and my cpu is at 39 degrees celcius. Thats a fairly low temp from my understanding.