My nephew bought a GTX 1060 and installed it into an older Windows 7 HP Pavilion. Now the HP Pavilion freezes on the boot screen that allows you to go into BIOS and makes a single beep every 25 to 30 seconds. I've tested the GPU on my own computer, and it works beautifully. My nephew's computer is old, but he has a 500 Watt power supply that I gave him. So when I remove the GTX 1060 the computer works fine; but when I insert the 1060, the BIOS screen freezes and computer beeps every 25 seconds. Any ideas?