question

[EricLidwa]

I just got my inspiron3200 back from repair (smoke came out of it during
demonstration - Dell people put a new heat sink).
While I was playing with it I started :
$ yes > /dev/null &
twenty times and let it run for about 30 minutes. My CPU indicator "hit the
roof"
later on I killed them all and "ps" or "jobs" indicated that all the twenty
"yes" were dead. Now the Cpu indicator was showing 100% and everything was
very slow (as though all the "yes" or at least one was still running). I
logged in as root and that didn't help. 
Why was CPU working like crazy since there was no indication of any running
jobs?
In order to post this message I had to reboot to windowz (where I live the
only local ISP is AOL - which is not Linux friendly).
When I halted the system it took Linux almost 5minutes to do it (usually it
takes about 15 seconds). Obviously something interesting was going on but I
have no idea what.
Now after rebooting and checking everything is back to normal.
Any suggestions?
PS. Has anybody else had smoking adventure with inspiron3200?

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