SCSI System hangs when booting

We are running a P3 600 MMX with a SUPER MICRO DUAL CPU& SCSI motherboard.  There are 3 9gb SCSI hard drives with windows 2000. I have just upgraded the memory from 256mb to 768mb (PC 100).  Every time the system is re-booted, the boot up hangs after checking the memory and finding the CD-ROM. If I remove the memory and go back to the original 256mb, it boots up without a problem.  

I am now finding that if I go into system setup at the startup and wait ( and don't touch anything) it will then boot up as normal.

Any Ideas

 
godcom1Asked:
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1175089Connect With a Mentor Commented:
I guess that your "old" memoty is 2x128MB. Some "old" motherboards has a problem with new 256MB DIM's with memory chips 16x16 and 32x8, for example MB's with nord bridge VIA693. They will see only half size from the full memory. Those with VIA694 will see full memory.
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dbruntonCommented:
I presume you haven't disturbed a terminator on the SCSI cable or devices anywhere?
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godcom1Author Commented:
Nothing has been disturbed on the Cable....
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1175089Commented:
Probably your memory configuration isn't OK, some shipsets cant cache more than 512MB.Is the new memory sticks are the same with old one? (768MB sounds like 3x256MB or 512MB+256MB).If they are 3x256MB try with only 2x256 (512MB total), if they are 512MB+256MB try with 1x512MB only.
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godcom1Author Commented:
The memory is 2x256 and 2x128mb.  
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