Bought an XP1700+ JIUHB on Ebay and installed it in a brand new straight-out-of-the-box NF7 (non-S) with 2 x 256mb DDR400. Booted into BIOS, set the multiplier to 11 and the FSB to 133, set the ratio for DDR400 (yes, I know this was stupid, should have kept the ratio synchronous), then saved CMOS. Screen went blank and I got no further life out of this cpu/mobo combination. After days of messing about I RMA'd the mobo to Redstore (who were excellent). After getting my replacement mobo I tried the XP1700+ again but still dead. Installed an XP1800+ T'bred A and this works just fine, so it was the cpu that died, not the mobo (sorry, Redstore!). Question is, why did it die? The HSF was installed correctly and when I checked the temps in BIOS the cpu was only like 28 deg or something.
Anyway, thought I'd just post my story to see if anyone has had a similar experience, or any clues as to what I did wrong.
The XP1700+ is going to be sold on as a keyfob - I've got a buyer for £5.00 plus p&p!