Memory For G5 Mac

Hi I have a issue when trying to boot up I don't get the chime instead I get two blink with the LED. I remove the memory and I get one blink with the LED light. What are the different code for this, for I believe my Mac is failing some boot test and is trying to tell me what the problem is. Bad memory or bad logic board, I think bad memory for this same unit I got to chime when I use memory I had bought from best buy and returned. Price was better online but know Im think it was a mistake. Pleas do tell what must be the next part to be fix. Oh and there now hard drive yet or os installed I just wonder if that can prevent the chime also.
Mac

G5, G4, Mac OS X (10.4.11)

Memory For G5 Mac Pro

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AirMemory

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Power Mac G5 Operating System

Compatible Apple Memory upgrades for Apple MacBook Pro, all Apple Memory upgrades listed carries a lifetime warranty and is tested for quality. Samsung RAM Memory for Apple Mac, Apple iMac, Apple iBook, Apple PowerBook Memory RAM Upgrade. In order to use ECC Memory in Power Mac G5 - all installed memory must be of the ECC Non-Registered type. ECC memory is recommended when using G5 as a high-performance server or for mission critical applications which require precision data with no error tolerance. ECC Memory is able to correct errors caused by random neutrino partical encounters. Mac Specs By Capability Actual Maximum RAM Power Mac G5 Models. The actual maximum RAM of each Power Mac G5 is listed below along with its compatible RAM type, default amount of RAM pre-installed, common identifiers suitable to identify a Power Mac G5 in order to determine its RAM capacity, and more. If you are not sure which Power Mac G5 you have, and the Model Identifier and EMC.