If your computer hangs-up for a little time you must assure that it also gives a noise too when it got stops.
1. Disconnect every cable connected to your CPU.
2. Open up the CPU case.
3. look for hard-disk.
4. see cables connected to it, disconnect it and clean it, by blowing into it.
5. clean hard-disk by blowing to its connectors.
6. reconnect again all cables and turn PC on.
there you go.
if it still giving you those, its time to change you computer cables, they are damaged inside.
But it will work i did it severl time and it worked.