Why is load on my server stuck at 1

[Dan Track]

Hi,

I'm curious to find out why the load on my server is stuck at 1.00,
excerpt from top:

top - 10:53:10 up 21 days, 46 min,  1 user,  load average: 1.00, 1.00, 1.00

top - 10:54:20 up 21 days, 47 min,  1 user,  load average: 1.06, 1.01, 1.00
Tasks: 197 total,   1 running, 196 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.0%sy,  0.0%ni, 99.9%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   4046512k total,  3866008k used,   180504k free,   401180k buffers
Swap:  6094840k total,   120936k used,  5973904k free,  3182948k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      15   0 10344  568  540 S    0  0.0   0:02.03 init [3]


As you can see top isn't showing anything, how can I find out what is
causing this?

Thanks in advance
Dan