The Lenovo IS7XM (Rev 1.0) Go to product viewer dialog for this item.
He looked at the board again. The IS7XM Rev 1.0 had a specific quirk. It monitored the RPM of the CPU fan, but due to a BIOS bug on early revisions, it required a minimum RPM of 800. The silent aftermarket fan the student had installed was running at a whisper-quiet 600 RPM. The board thought the fan was broken. lenovo is7xm rev 10 motherboard manual