Quote Originally Posted by badwhale View Post
Nah, it's in there with the "snap"

It doesn't give me any beeps, and the vid card fan runs full tilt, like on startup prior to the BIOS.

Asus M3N-HT is supposed to support DDR2 PC8500, but apparently it doesn't like it.
Not sure if that's the right RAM for that mobo:

4 x DIMM, Max. 8 GB, DDR2 1066/800/667/533 Non-ECC,Un-buffered Memory
Dual Channel memory architecture
*DDR2 1066 is supported by AM2+ CPU only
**When installing total memory of 4GB capacity or more, Windows® 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.

From the following spec page:

http://www.asus.com/Motherboards/AMD...specifications

It's very important that the RAM is non-ECC as well. Check the packaging on your replacement RAM and if it doesn't match the above, then you have the wrong RAM.