Hey guys my computer is not giving dispaly but the sounds are working in the background i thought it was a power issue so i unplugged my optical drives cable and started to working again for some time but again it started to behave like that im running mp pc on a branded 300w psu on these specs core 2 duo 3.0ghz e8400,4gb ddr3 ram,sapphire hd 7770 ,500 wd hdd,and some intel motherboard with some random things so if i change my psu will it work fine like 450w or something or it is an other issue ............. guys plz help me i'm so worried about my pc