I looked in the /var/log/ directory and there is no syslog.
Ah, maybe SuSE calls it something else then - I did use SuSE myself for a while (nice distro) but I can't remember where / what the system logs were called. It is possible to view the logs using YaST - you could try that..
The temperature thing seems odd - sure, if there was a temperature warning then that's got to be taken as a pointer. I can't understand how XP seems to get along fine though...
As for motherboard compatibility - the main thing is, what north / southbridge chipset is in use? what peripheral stuff is on the board, and what chipsets (eg, LAN, sound, video, etc.)?
Perhaps you could check your bootup log file (see YaST again..), maybe post back here - there may be some clues in there..