CompuServe Messages

All, I have been having an ongoing problem with 3ds3 crashing while rendering. the problem is intermittent with no apparent pattern. some times it will not render a single frame without crashing, other times it may render 50-100 frames before crashing. I have tried the following test to no avail: 1. Disable Shadow ram 2. Removed all tsr's etc. from config.sys and autoexec.bat 3. Used qemm to remove memory segment of Targa+ card 4. Physically removed all peripherals from system (including targa and scsi controller) 5. Changed Vga cards 6. Rendered to Null device 7. Rendered with network que at this point i believe a replacement motherboard may be my only solution. the motherboard in this system is from a now defunct (Gecco) manufacturer and is probably not 100% compatible. Is this a logical assumption or am i missing something else?? the system is a 486/50 mhz with 32meg of ram and a 500 meg hd. 3ds3 crashes with out regard to page swapping.