This board is really giving me a headache

I installed my new system yesterday, and all worked for a little while. It seemed very slow booting, and sometimes it did not want to proceed from the first screen, Platinum, requiring a restart. It usuallt booted on a second attempt.

I upgraded the bios to modded 1.37. After this it wont recognise any USB devices (keyboard and mouse attached).

I now tried to do a reinstall after flashing back to 1.36 bios. I attached my floppy, press F6 when XP setup is initialized, but when I am requested to put in my sata floppydisk, the pc can't read the disk. Seems like either my floppy is dead (seems to work ok according to lights and noice) or the MB can't communicate with it. (similar to usb devices).

Questions:

1. What is wrong with the USB?
2. How can I install sata drivers for XP without floppy?
3 Is the board dead?

My ram is OCZ PC 3200 512MB EL Dual CH Platinum rev.2 (only one stick of 512mb installed now), CPU is Winchester 3200+, Samsung 1614C sata disk.

Pls help!