Compaq Presario desktop

[Alex2016300]

I have Compaq Presario. I opened the case and took it apart and put it back together. Now on the screen show this ( Disk boot failure, insert system disk and press enter). this the first time opening a computer case, I might have did some wrong, but can't figure it out..Can anyone tell me what is the solution for this, how can I fix it ? Thanks

 

[logainofhades]

Make sure all the cables, for your hard drive, are correctly connected.