hello, i bought a new sound card and i tried to connect it to one of the PCI slot, when i was about to install the driver for the sound card. my screen freezes so i switch my computer off. after that, i started it again however it doesnt work. so, i decided to remove the sound card and the computer worked however the output of the graphics is blurred. so i removed the video card and cleaned it. so it worked again.. after that i put the sound card again and same thing happened. screen freezes i turned it off and when i powered it back on, a beep was heard coming from the mobo so i removed the ram and cleaned it. when i put the ram back and turned on the computer but it doesnt work.. is my mobo defected? because i tried replacing the power supply but it still doesnt work... Help me pls.. i really need tips... Thanks!!!