Boot disk doesn't boot

Hi,
I just installed my MS-6380 KT3 Ultra MoBo, everything working just fine. Except for one thing; every single boot disk I make (GRUB/Win98/DOS6.22/DR DOS/Win95), it doesn't boot on my pc. The bootdisks boot on the other PC I own tho.
I've setup the Boot Sequence in the BIOS correctly, it says 'Searching for Boot Record on Floppy...', then just boots from my C: drive. I've tried enabling the Floppy Seek option in the BIOS, but it didn't work.
Someone please help me, I need this urgently to boot my second OS (SkyOS).
Thank you.

Let me get this straight; by lead you mean the connector to wich the drive is plugged in? Because there is just one of that.
I've tried a different drive, but same problem. :(
But the drive works just fine, I can read and write to a disk, including the bootsector.

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