Problems with startup / no sound / webvideos

Hello everyone.
Since I last updated my iMac two days ago 02/18/09 (accepting program updates, and also a security update from apple) my computer is running differently. The startup takes forever (wheel screen, blue screen) and and it seems that the computer doesn't locate the sound board, answering at the "system preferences that there is no output / input devices found (not even built-in speakers) .
So if anyone can help me solve this I would be very thankful. Since there is a lot of small problems, I will separate them here:
1. Long startup
2. No sound
3. Internet videos not functioning
4. Scrollball at the mouse seems broken
Thanks!
Luis Corvini Filho

Luis,
Welcome to Apple Discussions.
I would recommend that you download the [Mac OS X 10.5.6 Combo Update|http://support.apple.com/downloads/MacOS_X_10_5_6_ComboUpdate] and install that. Some folks (myself included) who have had problems with the Software Update have been able to get a stable system via installing the Combo. It is a large file (668Mb) but in my view worth downloading and installing.
Chris

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