I've seen situations like this from a heatsink/fan on the cpu being plugged and the processor overheating
Originally Posted by jackalltt
Seen this also.
Couple years ago had a LF who had similar issues as the OP, plus her 6 yr old desktop fans were always running full speed several minutes after booting up. Asked her when was the last time her PC was cleaned out. She replied never! Well opened it up and it was filthy inside! All full of crap and dust. Heatsink/fan and CPU fins were totally plugged up with dirt sucked in over those 6 yrs! Cleaned/vacuumed it out. Took apart heatsink/fan to clean out the CPU fins. Put it together, fired it up and problem solved. Ran normal, was quiet again and fans didn't go to high speed anymore. Told her she should clean out her PC once a year at least.