Over the past year and a half I have been constantly fixing my parents computer. It stared when the onboard LAN went out. I put in a PCI LAN card and it worked good for about a year and then quit. I then swapped it to a new PCI slot and it worked fine for a couple months before it stopped working again. I then bought a USB to Ethernet and I had to unplug it and plug it back in every restart. Now there is no video coming from on-board video. Has the motherboard experienced the dreaded cascade failure. It’s been my experience that if it’s the PSU at fault the PC usually won’t come on at all. Thanks in advance.