bootloader(?) screwed up?

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http://www.linuxquestions.org – I have a dual boot setup with xp on one hd and ubuntu on a second hd. I recently upgraded to 10.04 and started getting the message on my monitor saying "input signal out of range". I searched on how to fix this and was advised to do this: " sudo dpkg-reconfigure xserver -xorg " and this unfortunately screwed up my boot options and would no longer go into ubuntu. So me thinking I was being clever, decided to format the partition with ubuntu on and now my PC just tries to boot into XP but loops before the XP splash screen. I don't want to have to flatten my PC as there is too (HowTos)