Windows fixmbr is a dangerous tool if you dual (or in your case I suspect tripple) boot It overwrites the mbr completely with M$ idea of mbr.
But mind you MBR means Master Boot Record and you only have one for each hard drive so if XP goes blank and Feisty at least get started to scan disks....
We need more details:
How many hard drives have you got?
How are they partitioned?
Where was grub installed? If you used the default setting it's in the MBR of the disk with "the lowest number".
What happens if you start from the Bianca or Feisty live CD? Most likely you will be able to boot from that and then make repairs. (and you need to be really careful here)
Unfortunately suspend does mean things sometime