Win 8 Dual boot reports HD Failed but XP works OK

Hi,
I dualboot W8 & XP, this morning W8 did not boot normally but, in a very restrictaed way reminisent of the XP "Safe Mode", with the error icon saying
" HD problem" back your files, pls see attached.
I recycled the HD cables rebooted W8 several times with the same, then booted in XP & all worked fine, no problems reported, even FSX worked.
Can anybody help on this please?

http://img834.imageshack.us/img834/4188/6qwz.jpg

Asus P5K Premium WiFiiFi Intel Core 2 Quad Pro 2.4GHz, OCZ Vendetta Cpu Cooler, 2x2GB, DDR2 800 PC2-6400, GeForce 9800 GTX (PCI-E), sata 500gb Seagate Barraguta HD , Corsair 750M Psu, X45, Dual boot Win8 64 & XPhome sp3.