PSU problem or Mobo compatibility problem?

[HeavyDrugs]

I bought a Radeon HD 5450 and I installed it and everything, just didn't install the drivers. I plugged my monitor into the 5450 and my monitor just goes to sleep. I have the >Lenovo ThinkCentre Edge 72 3484-FDU< and my PSU wattage is 180. Do I need a new PSU for my gpu to work?

P.S. If so, how I find out if a PSU will fit into my tower?

 

[Bad_Kitty13]

most likely your power supply cant handle the card, a 180w psu is rreally low

http://pcpartpicker.com/part/antec-power-supply-vp450
this psu would be more than enough for what you need and ok qulity. it will suffice for your needs and is only 30 dollars

your mobo supports the card but likely isnt recieving enough power to turn on