system wont shut down fully- lights flash and some noises??

[jaarus]

[liljim]

[jaarus]

[liljim]

[Gecko]

This sounds like it could be a blown/bulging aluminum capacitor on the motherboard to me.
It’s easy to spot one if you know what to look for, aluminum capacitor are about .375 to .50 inches tall and about .25 inches in diameter.
The top of a good capacitor should be slightly concave to flat, a blown/bulging capacitor will be convex on the top.
I have seen a few systems that would not shut off as you described they all had at least one bad aluminum capacitor.

PcStats has an article about blown/bulging capacitors you can read it