I bought a ASUS ENGTS250 1G video card and a Ultra LSP 450 power supply. I have been playing borderlands just fine and beat the game and am into the add-ons now with no problems till today. Now when i start playing the game about a min. into gameplay flashing lines appear and if i don't exit quickly, it blacks out leaving me with just sound. The card has never been over 55c. I am starting to think it is a power issue even tho the power supply meets the recommended stats for the card.I am about to try and use OCCT to stress test my system, and either way the results go i need to know what course of action to take to resolve this problem. Thank you in advance for your time and help.