EDIT: Updates posted below! New issue detected... Hello, I just built my first PC off an MSI K9NBPM2-FID. I'm getting beeps when I turn on my computer and after reading all the AMI beep code explanations I'm conflicted over what they mean. It's two quick beeps (about a half-second apart), but it's sometimes followed by a longer beep (probably signaling the end of the POST test?) I'm reading that the two short beeps might be a memory failure, but the one longer beep means it passed the POST tests... Here's the situations. I have the following dual-channel memory, rated @ 2.2v: 2 x Patriot 1GB - PDC22G6400LLK 2 x Patriot 512MB - PDC21G6400LLK With all 4 DIMMs in, the computer won't even go to the POST screen... just blank. Does it matter that two are 1GB and two are 512MB? I made sure to match them in pairs for the dual channels... With the 2 x 1GB DIMMs in, i hear two short beeps (see image below) and then it boots-up fine. However, if I set "Quick Boot" to disabled for those extra diagnostics, I get one more solid beep right when it switches to load the boot disk and boots up fine. With the 2 x 512MB DIMMs in, I still hear the two short beeps, but it doesn't matter whether I have "Quick Boot" enabled or disabled, i always get that longer lower-pitched beep just before it loads the boot disk. (in the picture, i had 128MB set aside for VGA, so 1920MB sounds right) I have tried each DIMM seperately in slot one, then each one in slot 2, and I'm always hearing those two beeps. I ran memtest86 which found no issues. I also disconnected all my PCI cards and SATA/IDE drives, but always the same two beeps. When I load the performance tab under task manager, it always reads the correct amount of memory (1984mb or 960mb with 64mb set aside for VGA in BIOS). The one thing I wasn't sure about in the beginning was what to set the voltage at safely. it's been at 1.9v since I built it (BIOS default), so I thought raising it to 2.15v might fix the problem and even make it to POST with all four DIMMs in (Anything 2.2v and over in the BIOS reads out "not recommended settings, the system may be unstable" but maybe if the RAM is rated at 2.2v it's ok?) Thanks for taking the time to read all this, I hope you can help me figure this out!