After installing new graphics card goes into power saving mode(works sometimes after restarting several times)

ako_md

Prominent
Jul 5, 2017
2
0
510
intel core 2 quad q6600 kentsfield 2.4ghz
psu gigabyte ge-c420a-c2 420watts
gigabyte x38 dq6 motherboard
5gb ram ddr2
win 10 64bit enterprise
old card ati radeon 3850 hd
i recently bought a radeon r9 270x which sometimes works perfectly
and sometimes an error occurs where some partial green text appears on the boot screen which is a sign that makes the monitor go into power saving mode, when the green text isnt there, it boots perfectly without crashing nor hanging even when playing games eg cs go, dragons dogma etc, please help me get rid of this green text problem
http://imgur.com/a/t2SrM (when all the text is white it basically means it will boot perfectly unless green text comes instead of white )
 
Solution
Could be a bad quality or too weak power supply, could be a bad video card, could be a driver issue. What is the brand and model of the power supply? Was this a new or used video card?