Ok, this isn't the first system I've build, but it's been awhile so maybe I'm just doing something stupid. I'm putting together: P4 3.2 512K Cache 800MHz FSB Intel D865PERL Motherboard Corsair DDR400 512MB (1 stick) Model #: CMX512-3200LL ATI Radeon 9800XT 256MB Creative Audigy2 80GB SATA HD 400W Power Supply Sony DRU500A DVD+-R/RW I just got it all thrown together last night and when I turn it on, I get 3 beeps all equal in length. The mobo manual is crap and doesn't say diddly about beep codes. I went to Intel's site and did some Google searching and from what I've found out, it seems that the mobo is having problems reading the memory. To test: 1. I've taken the RAM out completely, booted, same beep codes. 2. Unhooked all add-in cards except DVD burner (which I know is not an add-in 'card'), same beep codes. 3. I've replaced the RAM with 2x256 PC2700 DDR generic (that I know works, as I'm using them in another system), same beep codes. 4. I've taken the processor out, won't even power mobo so I'm assuming that seems to be working. Going to throw that into another machine tonight to verify. 5. Now, I've never worked with SATA before, but I have that connected to one of the SATA controllers on the mobo, and the DVD+R as a slave on the secondary IDE channel. 6. I've taken the Corsair RAM and thrown it in the system where I had the 2 256MB generic sticks in, and that system works fine with the CORSAIR RAM. All Intel's site says to do is make sure that the RAM is 400/533/800MHz compatible. At least that's all I can understand from it anyway. Can someone please offer a few suggestions as to what to check? Thank you.