Two 1GB memory modules don't work on MS-7173 board

Hi,
I have an old MS-7173 (RC410M) board, with 1 memory stick of model: Kingston KVR667D2N5/1GB, 1.8v.
I bought another memory stick with the exact model.
I tried them both, but I get a computer restart once windows starts booting.
Each of them works on its own, on either slots - tried all combos.
This proved me that slots and sticks are fine.
Only when placed together they don't work.
I tried switching between them, but it didn't help.
In the BIOS the Timing is set to AUTO.
According to the manual it should support this configuration.
Any clue why this doesn't work?

A couple things could be the problem as to why they do not work together:
Even though they have the same part number, the chips on the sticks may come from different manufacturers and not be compatible.
The memory voltage might need to be raised to 1.85 or 1.9 volts to get them to work together.
Try raising the memory voltage in the bios first and if that does not work, you will probably have to purchase a matched pair of sticks to get them to work together.

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