Problem with 3rd party RAM for Thinkpad T400

Hey everyone,
I just installed 1GB Hynix RAM (came from my macbook pro) onto my Thinkpad T400. At first, it booted up fine. I did all the memory tests and everything. No problems found.
However, every once in a while, when I reboot my laptop, the bios beeps once, three times, once, then three times. I looked up the beep codes and called customer service and it has to do with the memory.
Sometimes when I press the power button, the laptop turns on but the screen doesn't. I just have to force it to shut down then restart...then it's fine.
Any suggestions? (besides buying overpriced lenovo branded RAM)
Thanks in advance.

gatorman1122,
umm, i think we've already established that it's DDR3. it's absolutely impossible to make DDR2 modules work in your system even if you removed the check pin from the socket. and, even if you did get it to fit, your system wouldn't even POST. the pins are different in both quantity and mapping.
what hasn't been established, however, are the exact specs (not the type) of the module installed. what speed is the module? what's the part number? is it an original apple module or an aftermarket? again, more info is needed on what you installed.
also, what beep code are you getting? is it the beep code for memory or for something else? you can check codes in the T400 HMM if you haven't already.
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

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