Yesterday, I opened the case of my computer and cleaned the cards and other devices. When I re-assembled the computer and powered it on, Windows 7 works very slowly and the CPU usage in the task manager and in gadget always shows 100% usage. I've noticed the computer responding very slowly. What could have caused this?
migrated from stackoverflow.com Mar 2 '12 at 8:38
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From your description, it sounds like the system is throttling the CPU.
What probably happened is that after working inside the system, you may have caused an obstruction of airflow (e.g., moving cables, etc. in the way) or blown some dust into the CPU’s heatsink. This causes the system to run hotter than it used to, and so your system is throttling the CPU to cool it down, which makes the whole thing feel really sluggish and unresponsive, including the mouse cursor.