I've been plagued with this POST message since I received my new IS-7 board this week. Here's the timeline. The board shipped with BIOS 13. After assembly, I cleared CMOS, then powered up. At first POST, I got a CMOS checksum error, which is expected I think after a CCMOS. I hit DEL to get into BIOS and entered SOFTMENU. I noticed that the CPU was identifed as the correct one (P4 2.4C), but it was reporting as running at 100x12. So I hit F10, saved and rebooted. Next POST it still reports the ID correctly, but speed incorrectly. Since I needed the RAID 1 functionality of BIOS 15, I decided to flash. After flash and boot, the POST reports the correct ID and correct speed (200x12). But as soon as the IDE scan is completed, the dreaded CPU has changed or is unworkable message appears. I go into SOFTMENU and all looks well. ID'd as the P4 2.4C and reported as running at 200x12. F10 to save, reboot & POST gives me the same message. Over and over again. I think I may need to RMA the board. I'm sure the CPU is ok, but will verify in another system this weekend. Any other ideas before I RMA the board? thanks, Mike