Hello friend,I will try and go into detail what I have done,the computer I bought had a froze hard drive(mechanical) I purchased a maxter used 40 gig hard drive off ebay, installed it,I formated it first,then I installed windows xp pro on it,by letting it partition the entire drive as ntfs,all except for 8mb that windows said was for formatting tools, the install went smooth no problems,I used the coa key numbers that was on the sticker on the computer. As long as I have the cd in ,it will come up and say strike any key to boot to cd ,then it will boot up the hard drive after that,if I take the cd out,it just comes up strike f1 to continue,or f2 for utilies. I have tried boot repair from the xp cd. all the files are there,I am starting to look at maby a bios upgrade next? By the way I also had a 20 gig hard drive and it done the same thing. Thanks for the help......Ken