Computer hangs on "blue" screen, not making it to desktop

Hello,
I don't know if this is a recent issue due to OS 10.5.3 or 10.5.4 but recently I've been experiencing hangs when starting up. I get to a "blue" screen. Sometimes I'm just stuck there, other times it goes to the desktop. I'm running 10.5.4 on a Dual 1.0Ghz MDD G4. Anyone else experience this? Any solutions?
Oh, I've repaired disk permissions and reset PRAM also. Same issues exist.
Thanks in advance!

Start with http://support.apple.com/kb/TS1541

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