i recently got a xeon e3-1230 v5 mid tower server that has a 290w PSU i also got a evga gtx 750 ti.tho it is reccommened to have a 300w PSU.i saw people online running it on PSUS with less then 290w.when i plug in the gpu the pc starts up but the fans start spinning really fast and nothing shows up in the display.i tried this twice and only let it run for 15-20 sec cuz im not rly geeky in pcs and was scared by how fast the fans were spinning.should i keep it running,or is this a bad sign?and i should consider buying a PSU.also there was a flashing yellow light both times after i powered it down.