G5 won't boot after blue screen

My PowerMac G5 won't boot: it passes the grey screen with the apple logo then gets stuck in the blue screen. this is happening since I tried to connect a second display: that time the computer froze.
I have tried safe booting and then it works fine. I've reinstalled 10.4 but it doesn't make a difference.
Does this sound familiar to anybody? Could it be a video card/motherboard/HD problem?
All tips are very welcome.
PowerMac G5/10.4/ATI Radeon 9600

Here's more on what macbig said.
Try using Disk Utility to do a Disk Repair, as shown in this link, while booted up on your install disk.
You could have some directory corruption. Let us know what errors Disk Utility reports and if DU was able to repair them.
Then Repair Permissions.
Here's Apples Blue Screen faq.
DALE

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