Built many puters but never had this issue: Computer was running fine with below hardware except 750Ti purchased yesterday. Son downloaded drivers for 750Ti card online but doesn't think he installed the drivers. He took out old temporary graphics card which was working and inserted the 750Ti. Within 6 seconds Computer Beeps a couple times and shuts off. Inserted former graphics card which used to work and now it too won't POST or Boot! I plugged in the USB pendrive with windows installation on it that I used to build it a few weeks ago which worked fine but it won't go into install which didn't surprise me since it won't POST/Bios. with the same 6-7 second shutdown. Tried to clear CMOS took battery out then back in still no luck. I know P/S is low wattage but it won't even post using the former graphics or onboard graphics now via DVI or HDMI. We're stuck! Any ideas would be very very appreciated.
Hardware:
Mobo Gigabyte B85M-DS3H
Graphics card: EVGA GeForce 750Ti (Has NO separate 6-pin Power or any on Card)
Power Supply: EVGA 430 watt
DRIVE: Samsung EVO SSD
CPU Pentium G3258
O/S WINDOWS 8.1
Hardware:
Mobo Gigabyte B85M-DS3H
Graphics card: EVGA GeForce 750Ti (Has NO separate 6-pin Power or any on Card)
Power Supply: EVGA 430 watt
DRIVE: Samsung EVO SSD
CPU Pentium G3258
O/S WINDOWS 8.1