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It sounds like you've got a bad memory module, the second 1GB that you're trying to put in. Try replacing your good 1GB module with this new one and see if it reacts the same way. I looked up your MB manual and it does say it's rated for 2 x 1GB modules.
A slight possibility is that you're trying to put 240 pin memory in the Dimm slot, instead of 184, but that's unlikely because the notch doesn't line up. Another one, also unlikely is that you're trying to put in DDR266 or 333 when your front side bus is running at DDR400 speed.
It's also extremely rare, but you may have to change your settings in the BIOS to get it to recognize the new module. Although that almost never sets off the "emergency siren".
When I updated to 2GB for my 754 motherboard, I bought 2 brand new modules that turned out to be both bad.
Maybe 1GB is the maximum amount of memory that your system will hold. And maybe your system likes memory to be in pairs, so when you put the 1GB in by itself it didn't work, but when you put it in with a 512MB it works.
you quote one of your memory sticks as being pc 2700 when earlier in your text you qoute pc3200.
Firstly pc 3200 is 400 mhz clock speed memory.Secondly, pc 2700 is 333mhz clock speed and you acnnot mix the two on the same board. Thirdly does your board support 3ghz anyway. If you are running a board at 400mhz, pc2700 memory will not run at 400mhz.
Solution, take out the pc 2700 memory and all will be well.
Hi reisrui, yes it is odd. (It's not the first time I have seen this.)
According to you're manual on page 6, under Specifications. The manual say's you can run up to a Max speed of PC3200 400MHz, 1GB in slot one. In slot 2 you can run a Max of 1GB of PC2700 333MHz in slot 2. Every motherboard I have come across that can run two different speeds of memory. The system will reduce the Max speed to the lower MHz memory speed. If you currently are using 512MB PC3200 400MHz in slot 1 & add 1GB of PC3200 400MHz into slot 2 for a total of 1.5GB of memory. The motherboard will ruduce the total memory over all speed to PC2700 333MHz. Motherboards alway run at the lower memory speed if two different speeds are presant.
I can’t be 100% sure of the 1GB of PC3200 400MHz into slot 2, will run at all! Or if it will be reduce down to 333MHz. I am sure you can run 2GB of PC2700 333MHz, 1GB of memory per slot in you're board for a total of 2GB.
If I can help you further, feel free to post. Suggestions & comments welcomed.