there were originally some bios issues with the 1.3 duron. You may need a bios update, which means in order to perform this, you'll have to put the old processor back in. It's painful, I know, but you're a fighter, you can do it.
You should take a look at <A HREF="http://220.127.116.11/inetpub/ftproot/cpu_support_gigabyte..." target="_new">This Page</A> The GA-7ZM can't support the Duron Morgan or Athlon XP/MP/4 CPUs, too bad, look like you just learned an important lesson, always do extensive research on the compatibility of components you intend to buy.
After finding out that it probably was a BIOS-problem I decided to update the BIOS... So I got the new version and tried to install it as the instructions said... Of course the program didn't work so I tried a Windows-based program developed by Gigabyte... And guess what? It WORKED! The first 16% at least..... The computer crashed and left me with a corrupt BIOS. !"%!"#%"#
So... What to do? New mobo for a Duron 1,3 GHz? Don't think so... So I found a guy who could hotflash it for me. With the new version. And THEN it worked. So I decided to buy some more RAM now that SD is so cheap... So, of course I got a defective module! Woohoo am I lucky or what?..... Returned it and got a one that worked. Except that it is double-sided and doesn't work with my old modules. But that doesn't really matter... Only had 192 MB... But that was my own fault not checking compability.
Computers suck. But we can't live without them!
That's what my conclusion was too... I am no longer afraid to do ANYTHING to my computer. Upgrading CPU and BIOS was the first time I tried that and actually I am happy that it went relatively well. Seeing a computer working after your first try changing a CPU is wonderful. When you finally know if you broke it...
So at least I'm a lot more confident when working with my computer now that there are no longer any "do not even try to touch"-components. BTW I've just bought a Ti4200 and it works just fine with my 230W power supply.