asus p5kpl-cm my gpu wont work !!

[sleemunskey]

today a friend of mine give me a pc that as a p5kpl-cm mobo a e7500 with 4gb of ram
then i tried to put my gpu but it doesnt work . the radeon hd was working with my other pc.
what happed is that when I turn the pc on the fans are spinning but nothing appers on the screen but if I remouve the gpu and plug my display in the onboard gpu it work just fine !!

plz help me !!
ps sorry if my english is bad

 

[Sourabhskv74]

What is your Power supply? and exactly which Gpu you are trying to install?
any details?
it looks like you are facing PSU problem.

 

[sleemunskey]

What is your Power supply? and exactly which Gpu you are trying to install?
any details?
it looks like you are facing PSU problem.

450w psu with a crappy radeon hd 4000 series i dont know exacly the model but i know that it draw a little amount of power(it doesnt have a 6pin or8 pin connector)