My pc is a old one but a fairly new hard drive,and it only had the basic stuff in it,like explorer pack two and the windowsxp and a program called registar machinics,but tonite,all of a sudden it went blue,and I was trying to read what was on it,then it went black,saying Operation System Not Found.What is wrong with it?Do I need to buy another hard drive or a new computor.Its kinda old,but like I said it had no extra load,and had about 300 and something ram,and forty hard drive.It always defragged and said I had I had about 80 percent on hard drive, I just use it for games and read email and thats about all,and read and surf and read,thats it,I need someone to tell me what to do,its a pent,gateway essental,old bout 1999 but I paid a great deal for it years ago.It was top of the line that year,I replace the hard drive by Maxtor.Forty larger one then twenty that it had on it,the old one fried.And I got soft ware to get it booted up and it played for now about a year.,I need someone to tell me something,appricate any info,on this one.Black page,never wants to boot up,just says Operation System Not Found.After going through the windows deal that on windowsxp with the little white line at the top then it goes to that black deal.Thanks,hope you can make all this out,Im bout disgusted with it.Bout ready to junk it and go get another one.

Enter your BIOS (Basic Input-Output System); You usually enter the BIOS by repetedly tapping DELETE immedately as soon as you press the power switch. Check your documentation that came with your computer. On older, proprietary machines I have seen other keys used. In the first or second screen you will see all your drives listed. Your CD or DVD should be there, your floppy drive if you have one, and the hard drive. Do you see your hard drive listed?