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First of all, did you update the BIOS to version 5200 (I don't recommend the 5020 version due to various bugs) with your old i7-940 still on the board? Or did you put in the i7-980X before you run the BIOS update?
Second, I don't trust updating the BIOS from within Windows: You will never know what you're going to get; in fact, any manually tweaked settings set in the existing BIOS might mess up the updated BIOS, resulting in a bad BIOS flash and a corrupt system. Instead, I'd recommend updating the BIOS to 5200 with your old 940 still on the board using the Recovery BIOS method with the Recovery BIOS copied onto a USB flash drive (the flash drive must have been formatted using FAT or FAT32 and not NTFS or exFAT). And go back into the CMOS setup and load setup defaults to reset any tweaked processor and memory settings. Then, open your system's case and remove the single jumper from the motherboard completely (but please take note where the jumper originally was located so that you can reinstall the jumper in the exact same spot when you're done). The flash procedure can take several minutes to complete. After the flash is complete, reinstall the jumper in the exact same spot where you removed it from, and then remove the battery and let the system sit with the battery removed for a few minutes, then reinstall the battery. Now, replace the 940 with the 980X and then power your system back on - and load the setup defaults first, then reboot and enter the BIOS setup and then re-tweak your settings, then restart again.
When I ran the BIOS updateI had the 5020 version and I was updating to the 5200 version. I had my 940 in because my 980X wouldn't pass POST. I don't have any special BIOS settings (I think everything's still set to default. No overclocking) so I don't think that caused any issues.
I'll try the recovery method from a flash drive and see if that fixes anything. Thanks.
I was able to try to recover the BIOS tonight, but it had no effect. it still started up without doing anything. It didnmt seem to recognise the flash drive at all (I did format it for fat32) and nothing happened on the screen.
Ithink I may have mentioned thi, but I have two DX58SO mobo's, and I originally tried updating the BIOS on only one of them, but now neither seem to work at all. I'll take my processors down to my local computer place and see if they can verify if they're good or not.