[CentOS] Hlp with server load

I have a system that is running into problems with high load, however, even when I shut down everything that could be loading the system, the load continues to rise. I can't see anything that is causing the load. Any ideas?

08:36:06 up 1 day, 10:57, 3 users, load average: 19.98, 19.30, 17.29 90 processes: 75 sleeping, 2 running, 13 zombie, 0 stopped CPU states: cpu user nice system irq softirq iowait idle total 0.1% 0.0% 0.0% 0.1% 0.0% 0.0% 99.6% Mem: 511916k av, 317756k used, 194160k free, 0k shrd, 35040k buff 208896k actv, 67280k in_d, 10488k in_c Swap: 2048276k av, 5872k used, 2042404k free 172064k cached