I have an ASUS A7V8X-X with 1 HD 20GB, 1 HD 40GB, an Athlon XP 2000+, CD-RW drive, and a module of 128 MB 266 (that one was the only one I've got). This PC had some problems with Video Cards so it was always a "second option" in my house. It was not permanently in use. Yesteday I bougth a new 512 MB 400 module so I can have it running again in my room. 2 years ago I tried installing a 512MB 400 RAM module with no success. This time I really needed to add more memory. Salesman told me I could install this new RAM branded TITAN (known as "generic memory") along with the 128MB 266 one. I did so, when I came home. I left 128 one in the first slot, and placed the new 512 in the second slot. When I turned the system ON, a cloud of smoke came out from the RAM modules. I then immediately unplugged the cord. That smell of burnt platic was not good. I removed both RAMs and checked the new RAM for phisical damage. There are none visible. So I could go back and ask for a replacement, because it is warrantied for 6 month. I tried placing one by one the RAM modules again. No luck. System powers on giving the LONG and repetitive BEEPs meaning somethings is wrong with MEMORY (am I right?) Both modules in every 3 slots give no results but long beeps. I then tried removing a RAM module from other machine, this time a 256 MB 333 to check it in the A7V8X-X. I tried it in the 3 slots with no luck at all. So now I'm scared. I did not check back the 256MB module where it belongs to (to check if is was fried in the old PC, though I dont think so because no smoke this time). Plus I think I lost my old 128MB 266 RAM, plus the new 512 400 RAM (that I can exchange back). But the worst is I'm afraid I lost my ASUS A7V8X-X motherboard, or maybe it is damaged. I'm pretty sure my mistake was placing 2 memory modules that do not match speeds. Am I right? What happend? What can I do now?