Stuck at Blue Screen with Appearing & Disappearing Cursor

Hi.
I've been having this problem since a while ago. It happens randomly and I have no idea where to begin. The thing is, safe-boot always works to solve it temporarily, and the problem keeps coming back.
I've read about loginitems and i only have one item (ituneshelper) in the list.
I've already done a clean install but i'm still having this problem after using it for a month...
Hope you can help. Thanks!

You can try the methods described in this article
http://support.apple.com/kb/TS1417
Your profile says iMac G5, so you should be able to run Leopard. You do not have to install the original system first. An +Archive and Install+ is a good way to do the upgrade from Tiger to Leopard. However, if the volume has a disk directory (or other data corruption) error, you should resolve it before doing a major upgrade (or anything where a lot of new files are written to the volume).
If you contact Apple, you may be able to get a replacement disc for the one that came with your iMac model.
Do you have an external drive to which you can back up your current startup volume? It may have a startup problem, but it is probably still accessible, if you start up from another system on another volume.

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