Having a similar problem with my NF7-S2G. Siren on turning on. Tried both Semperon 2400 and Athlon XP 2600+ (266 T'bred) in it both same result. Had been working before w/Semperon then just "died" Any thoughts?
You need to turn off the temp monitoring in the BIOS code. Had a similar problem on a Abit AV8 (S939 K8T800 Pro chipset) Turn off the temp alarm but I would leave on the shutdown feature
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If that doesn't work, try assembling the computer outside the case. The MB box is handy for setting the MB on.
I'm going to split this off so you can have your own thread; the other one is nearly two years old - your problem should get more attention this way.