That has to do with the manufacturer of the motherboard. Not all RAM sticks are built the same. Your best bet is to go to Acer's website and see what they suggest for brands of RAM.
Memory modules are fickle mistresses; sometimes you'll need matching modules of RAM for it to be recognized properly. From what I'm understanding, you're trying to boot a module of 1GB and another of 512MB. Try to swap the native 512MB for another 1GB stick and see if it works. As well, it's a good idea to install RAM modules that were manufactured by the same company.
Before you do that, it's important to understand that the RAM modules are very delicate electronics. It's also entirely possible, if you haven't worn sufficient ElectroStatic Discharge (ESD) safety equipment, that static electricity could render a module useless. Performing a RAM swap in a proper environment and with the proper equipment (ESD bracelets, in this case) minimizes the possibility of static electricity junking computer components.
Also possible, albeit rare, is that the module is simply defective out of the box. If this appears to be the case, then you can simply return it with the receipt for a refund or an exchange.
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