PC won't shut down lately

[kmetek]

Recently it just won't shut down - I have a shutdown timer....or it's booting 2-3 minutes etc...what gives?
How do I find out what's causing this? Which tools/program to identify somehow the problem?

Thanks.

In event viewer i see this

warning Reset to device, \Device\RaidPort0, was issued.

event id: 129

source: iaStorA

http://social.technet.microsoft.com...viceraidport0-was-issued?forum=w7itprogeneral