IMac G4 signs on but shows blue screen...HELP!

when i turned on my computer this morning it turned on normally. it auto logged on but when it shows the startup box with the "loading" bar only says "starting Mac OS X". thats its and then it loads regularly with no messages of error. it loads into a blank blue screen with the mouse icon there and the disc tray opens too. i need help please!!!
I don't know if this is neccessary but it crashed before and replaced the HD with a 160GB HDD and upgraded the RAM to 1.25GB. and i also believe a new logic board was added as well.

Greg, Welcome to Apple Discussions:
Here's information from Apple Knowledge Base on
"Blue Screen at Startup"
http://docs.info.apple.com/article.html?artnum=106464#symp1
Let us know of any progress or questions you might have, Greg

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