How to determine if the memory sockets on the motherboard are bad:
1. If on the bootup the memory doesn't count up to the amount you have on the board then there is a possibility that the memory sockets on the board are bad. To isolate the problem down to the slot do following. Try switching the order of the SIMMs if the memory counts up to the same number as before then the problem may with the slot.
2. If during the HIMEM.SYS test the memory test fails then look at the memory address that it failed at and switch the order of the SIMMs. If the next the time the system gives a XMS Memory Test Fail Message look at the Memory address it failed at. If the address is the same as before then slot is bad and motherboard needs to be replaced. If the address is different then the problem is with the SIMMs.
3. If the customer has both BANKS full and if there is any kind of memory problems then swap the SIMMs from one bank to another and check to see if that solves it, otherwise the problem may be with the slots.