Freezing on blue boot screen.

My Ibook g4 is freezing on the blue screen right before the login screen. It seems like once and awhile (very rare) it will make it past the login. For example I haven't booted the computer in a few weeks, today it started up just fine and crashed about 2 or 3minutes later. It also sometimes freezes at the grey boot screen with the rotation indicator. I've tried booting in safe and single user mode and still have the same problem. I'm pretty sure I don't have much hard drive space left on the unit. I'm not really sure what the problem could be and im starting to think from reading up on it that its a logic board problem. Any input would be great.

Welcome to Apple Discussions!
It does sound like it could be a logic board problem, but if your hard drive is too full, that could be a problem too. Does it work any better when cold and if you squeeze the lower left corner? If so, that could point towards a logic board problem.
Do you have access to another Mac? If so, it might be possible to access your hard drive using Target Disk Mode and rescue your data. You really want to get your data saved before you do much else.
Do you have all the original CD's that came with the computer? Can you boot off of a CD? If so, you could go to Disk Utility on install disc #1 and see if you can verify and repair if necessary both permissions and the disk. You click on the brand name to do this. To check on how full your hard drive is, you can click on MacIntosh HD and see what it says at the bottom.
Once your data is rescued, you could try a clean install of the OS, in case corrupted software is part of the problem.
Good luck!

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