Listen to the beep codes and do a search form the online. The most common code error comes from the RAM or Video card. One of those is either bad or not installed correctly. The generally go something like "short, short, long, short" beeps. Get the pattern of it and then search the web for "d530c beep codes".
When I push the power button the fans kick on and then 1 beep about a second long when I push f1 the cpu fan goes into over drive and the hard drive sounds like it's chopping glass the only way to turn it off is by holding the button in. This tower was a loner to my sons business partner and returned after a bad break up (money) anyway PS cpu was HOTTT