Installed 14.10 64Bit - On Boot I Get A Black Screen?

[Jesse Palser]

Hi,

OK, I installed Kubuntu 14.10 64Bit onto the following desktop computer 
system:
- AMD FX 3.5GHz 8-Core C.P.U.
- AMD Radeon HD 7870 PCIe 2GB GDDR5 Graphic Adapter
- 32GB DDR3 RAM

This is a new install of Kubuntu onto above desktop from DVD.
The install is successful, but after reboot I get a black screen and the 
monitor turns off?
The weird thing is if I cold boot I get the black screen, but if I press 
reset I then get a menu and can boot into O.S.?

Any help would be appreciated, thanks!

Jesse