X220 will boot up when on the dock but when off the dock : error loading operating system

When the laptop is on the dock it will boot up to xp, however, when off the dock the following error appears:
ERROR LOADING OPERATING SYSTEM
Checked the bios tried in COMPAT AND AHCI modestill the same, changed the boot up selection, still the same       

hey sxmccr,
have you tried updating the BIOS for your unit ? Currently the X220 is at 1.21 and was released on Sept 7, 2011.
http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS018805
Do an update of your BIOS , though i would recommend updating everything.
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