Q: just got an ibook 12" g4 july 2005 that keeps telling me to restart, when I restart the report thats sent to apple says uncorrectable machine check amongst other stuff...but it keeps on telling me to restart,does this mean the machine is useless, i have t

Sounds like a kernel panic. See links for things to try.

http://support.apple.com/kb/ts3742

http://www.macworld.com/article/2027201/how-to-troubleshoot-a-kernel-panic.html

http://macs.about.com/od/usingyourmac/qt/Troubleshooting-Os-X-Kernel-Panics.htm

The machine could be repaired by a company that does circuit board re-soldering, since it is possible a heat-flex solder break on the main board may have caused either the processor or graphics chips to lose connection and that could manifest itself in a few somewhat documented ways.

There is an on-board RAM chip that may also have something to do with a kernel panic, if it no longer is functioning correctly; that is the non-removable one soldered on the board you never usually worry about.

Companies such as powerbookmedic, wegenermedia, and others can take in portable macs of vintage or newer (contact them for details on what they do, and how they accept work orders) for repair and can fix most anything; and have a parts inventory. Modern repair workstations allow the equipped service company to fix complex issues and they do troubleshooting. Sometimes the cost is less than a replacement logic board.

The links above may help isolate the general cause of a kernel panic. There are other articles in Support database including a deeper look into them.

•Technical Note TN2063: Understanding & Debugging Kernel Panics

https://developer.apple.com/library/mac/technotes/tn2063/_index.html

•Resolving Kernel Panics - The X Lab:

http://www.thexlab.com/faqs/kernelpanics.html

•Troubleshooting Kernel Panics:

http://www.thexlab.com/faqs/kernelpanics.html#Anchor-Troubleshooting-49575

Usually the issue is caused by hardware, especially if there is an indication of machine failure in the crash log or other screen image text.

A working last model MacBook (mid-2010) would be a better 'first mac' to have.

Hopefully you can sort it out.

If not, there likely are fair parts in it.

Good luck & happy computing!