Hi again everyone I hope someone can be of help to me here I will start giving as much detail as I can, it is a Dell XPS 720 running with 2 x 500 gig sata HDD with 3gig of RAM and windows 7 O/S the service tag is D6MSD3J. The trouble started when a man on the other end of the phone told me to unplug my HDD and plug one in that he had sold me to test as I intended to use it in a caddy anyway, well in doing this I believe I got the wires mixed up as there is another disc drive in there which I believe is cache anyway I am sure that problem is sorted now as 2 of the wires had the same part number so I thought it a safe bet those 2 must for HDD'S and the other for the cache drive but now when I power up it goes no further than saying starting windows with the logo above it and that is where it stops, I have tried booting from the windows disc and it still stops in the same place, at one time I do not know how I got there but it gave me a message saying control manager missing but as I cant boot from the disc I am a bit lost also I can no longer power off from the front I have to unplug it will power on from the front but not off, any advice on solving this problem greatly appreciated many thanks Chris