I have an HP Envy 700-230. Have changed stock power supply to a Corsair cx750m to power my gpu. This computer doesn't display anything or make beeps. I've tried different monitors, dvi cables(using integrated graphics for troubleshooting), as well as disconnect everything including fans to the point it was the CPU, psu, and ram. What's weird is when I turn off the computer through the case power button it doesn't turn off but instead increase the fan speed and the case lights turn off. Monitor doesn't scan when the computer is on and connected but instead falls asleep. Reconnecting the dvi cable makes the monitor display sleeping message again. Would definitely like some help on this. Have tried clearing cmos as well. I am slumped.