Ok. System Specs 2 x 256mb pny pc 2700 DDr memory Chips (samsung chipset) 1 x PNY Geforce 4 TI4600 1 x Athlon XP 2400+ (tryin to run at stock) 1 x Western Digital 80gb 7200rpm 8mb Cache Special Edition 1 x Lite-on 52x24x52 CDRW 1 x Enermax 431W PSU (eg465p-ve) and finally 1 x Asus A7N8X Deluxe Motherboard (tried both 1001.c and 1001.g) Now this is the problem. The computer will sometimes reboot in the middle of setting bios options. sometimes it will reboot before it even posts properly. it seems to get stuck in a rebooting loop until i clear the cmos. then i can set the bios. tell it its not an 1800+ but a 2400+ and restart to try to install windows. everytime it gets set to 2400+ it just restarts before the post can complete. on 1800+, i was able to install windows and some programs, but when i tried to burn a cd it rebooted again. Ive tried both the hd and the cdrw on the same ide chain, both on seperate chains, new ide cables, different memory chips(both pc2100 and pc2700), even a different cpu (xp 1600+) nothing seems to work. ive tried both the 1001.c bios which it shipped with and the 1001.g bios. It seems to get a bit further with the 1001.g bios as i can almost load windows with it set to 2400+. it restarts itself when the xp boot screen loads up. I know its not the cpu as it worked @ 2400+ in my epox 8k3a+ motherboard. Im a bit stumped as ive never seen a problem so widespread as well liek this. it seems everyone save for 1 or 2 percent of the people have problems with this board. any insight would be appreciated. thanks in advance guys. Ron Yeah i figured out that hdd prob quick cause ive had one before. New Info I got windows to install @ 2400+. ran fine. installed all my progs and stuff. still fine. ran benchmarks, 3dmark2001, sandra, www.pcpitstop.com, all fine. did all memory tests and all the cpu tests and video tests as well. all ran fine. i THOUGHT i ws in the clear I ran disk cleanup to clear unused files and such and it rebooted on me. i was like S**T!. now its in a rebooting loop again it wont boot off cd, just restarts, wont boot off hdd cause it says a files missing. i tried to replace file but cant boot off xp cd to repair the installation appreciate the help guys. ive been building systems for 9 yrs so yeah the hsf is on correctly. my teps are 123F which is well in normal temperatures. its definatly not ovverheating. its the retail hsf that came with chip and the hsf is pretty cool to the touch. slightly slightly warm but much much cooler than the chipset heatsink. as for memory weve tried 1 stick in just the black slot, just the blue slot and both in blue and 1 in black n one on blue. we have been using 5-5-2 for the memory The side of the case has never even made it to the case as we are constantly working on it. as for dimm voltage im not sure i think it was 2.8 but not positive. ill check it tommorow when i get into work. also i thought it could be the vcore its only 1.65 for the 2400+? is that normal? my 1800+ is like 1.750 and thats a slower chip.