I have an HP model 500-070 with Intel i3 CPU and Windows 10. After a shutdown in which the power was inadvertently shut off before the shutdown was complete, the computer would start to boot, but display an error message with the option to have the problem automatically corrected. After accepting that option, another error would be displayed, again with the option to be corrected. After that, the first problem would appear and so forth with never any progress toward completing the boot process. The only way to stop this was to pull the power plug. After several rounds of retrying this, and before I wrote down the error message, the computer died completely. Using a power supply tester, I found that the power supply was bad, so replaced it with a good one. Still, the computer will not boot. I have tried a bootable Windows 10 rescue CD and also a bootable memory stick. I then tried a MOBO test card. It does give five beeps when the power is turned on, but show no information on the POST display LCDs. I believe the computer has an AMI bios, so the 5 beeps would probably be a motherboard or CPU problem. Any suggestions? Do I have to bite the bullet and replace both the MOBO and CPU Is it reasonable that there could be no POST displays on the MOBO test card or is that card possibly bad also?