Jet That will cause a non-POST if you try to use stock settings at 250mhz. Some ZX's can't even reach 250mhz, let alone at those timings . Not your day today is it? We all get them .
Try upping your FSB by increments of 3 mhz keeping stock timings and memtesting between each. Then loosen when you start to get errors. We cannot recommend timings as such as we cannot know how well those sticks clock. As a rough guide, mine did 2-3-2-5 1T (stock) up to 217mhz.
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