Usually there is a option in BIOS to 'report all errors at startup' or 'ignore keyboard error'
Thanks for your advise and i did find Halt on Errors in BIOS and i have now set it to "All but Keyboard" and it works fine.Must do couple of boot to see everything fine. Puzzle:What happens if there is a genuine error in Keyboard while booting?. Also with the wireless keyboard now primary and only keyboard if i have to enter into BIOS while booting,the KeyBoard may not be effective as it may not have been recognised by Boot Sequence so early in Boot. (ie when we interrupt for entering into BIOS ?????) ie:I cannot interrupt by pressing DELETE KEY ?????
Thanks very much,