I've had this board for over 2 years, running a Core 2 Duo E6320 Conroe. Lovely. But I decided to upgrade.
Because I'm an idiot, I failed to update the bios in my P5W Deluxe before dropping in my new Core 2 Quad Q9550 Yorkfield. I haven't updated the BIOS in a long time, so I'm certain in hindsight that I would have had to do so before this CPU would work.
Machine didn't post, so I put the old CPU back in. Now it still won't post. I tried clearing CMOS, still no love. I tried disconnecting drives, swapping RAM, etc. No love.
Any thoughts or tricks? I didn't think I could actually destroy a motherboard by putting an unsupported LGA775 CPU in it, but I've apparently managed it!
Thanks for all the suggestions everyone. After much fussing, I finally gave up and ordered a new board (GIGABYTE GA-EP45-UD3R), probably time for an upgrade anyway.
BUT - when taking apart the old system again, I noticed that one of the tiny 775 pins was bent completely out of place. How that happened, I have no idea; very whack. After surgically re-bending that pin (thank god I had a magnifying glass and a needle handy), I popped the old CPU back in and viola, she posted and asked for new BIOS settings.
Moral of the story: despite the seemingly idiot-proof design of LGA775, it *is* possible to ding those little pins! Just another thing to put on the things-to-look-for-on-an-inexplicably-dead-pc checklist....