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Hard to say without knowing exactly what Mac you have and what specs, but most likely reason would be your system doesn't meet the requirements (From Apple support site) - To install Mavericks, you need one of these Macs:
iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later),
MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
Your Mac also needs:
OS X Mountain Lion, Lion, or Snow Leopard v10.6.8 already installed
Thias can also come from a dead hard drive, or a dead backlight (screen).
The best test would be to plug an external monitor to see if something shows up. If yes, that would mean that the backlight doesn't work anymore. If not, then you have an other hardware problem (motherboard, hard drive).
You can check if the hard disk is the problem by removing it. You should then see a flashing question mark and the screen on.
Keep in touch ;)