Apple Mac OS X Leopard won't work!

OK so i purchased Mac os x leopard and proceeded to do an erase and install (upgrade wouldn't work, and I didn't have anything on my computer that i really needed to save)... Well when i start running leopard after the install, everything freezes. Were the curser is, is the spinning wheel of death (apple's catchphrase for the colorful spinning circle). I am at a Whit's end, I cannot figure out what is causing this. Anyone have/had this problem? and if so how did you fix it.

Can you fill us in what sort of Mac you are using...ram etc

here is my hardware overview:


Machine Name: MacBook Pro 15"
Machine Model: MacBookPro1,1
CPU Type: Intel Core Duo
Number Of Cores: 2
CPU Speed: 2.16 GHz
L2 Cache (shared): 2 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP11.0055.B08
Serial Number: W86301FRVWZ
SMC Version: 1.2f10
Sudden Motion Sensor:
State: Enabled

here is my hardware overview:


Machine Name: MacBook Pro 15"
Machine Model: MacBookPro1,1
CPU Type: Intel Core Duo
Number Of Cores: 2
CPU Speed: 2.16 GHz
L2 Cache (shared): 2 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP11.0055.B08
Serial Number: ------------------
SMC Version: 1.2f10
Sudden Motion Sensor:
State: Enabled

Sorry for the double post

Surf to apple and download the 10.5.2 combo update and do it. Fixes lots of little things. Then report back to us.

ok i did that... its fine at the moment... we will see what happens.