Hi guys I have a problem with an old computer I recently inherited *compaq presario* and im not computer savy so im asking for everyones help. I will provide as much information as possible but the only thing it says on the outside of the computer is *pentium processor* and the name of the computer. I will start off with this, the computer did not come with a harddrive so I purchased one, its a maxtor 80gb 7200rpm and I think its refubished because it came out the box looking very terrible, the grey bag it came in was open and screws were everywhere in the box and the cd it came with was dirty and some what scratched. I had a friend open the case to the computer and it was very dusty I might add *giggle* and so we installed the harddrive *very easy* but as soon as we turned on the computer the harddrive was beeping several times and I get compaq splash screen and then a error *Non-system disk or error replace and strike any key when ready* this is what it says. I press control,Alt,Del to restart and the same thing happens all over again, what can I do? HELP!