O.k. so here is the problem; I have a custom-built computer that as service me well over the years that it was built. Its specs are as follows, ASUS FX3 class motherboard, 32GB DDR3 system memory, 12TB storage, HDMI video G-force Graphics with 4GB memory, AMD 9590 processor running at 5.0Ghz, 1,000-watt PSU. It is liquid cooled. About a month ago, it lost video, due to time limits, I decided to take it to a local computer repair shop, instead of repairing it myself. They had it over one and a half weeks and tell me that the motherboard, processor and graphics card are shot and have to be replaced. I collected the computer from them and purchased new parts as I was planning on building a new computer to replace this one soon. I built a new system using a gaming class ASUS X370-F motherboard, AMD Ryzen 7 3.6Ghz processor, 32GB DDR4 system memory, using the internal HDMI graphics and a new 1,000-watt PSU. I switched to an air-cooled configuration as liquid cool is not necessary. The problem I started having now I replace the computer case for one with better air flow design was the power for standby mode worked and if you tried to power the computer up it would spin up the fans and power back down. After several failed attempts to correct it, I decided that the new case power switch might be bad. I placed the new parts in the old case, and it powers up, it does not appear to perform the POST or attempts to display video. The power does stay on until I switch it off. I am out of ideas to try to verify the computer is powering up and working. I welcome all inputs to resolve this strange issue.