Computer shuts off by itself, please help.
I have a HP a6242n computer with Windows 7.
Recently, it shut down by itself. I replaced the CPU and case fans. It worked for a while and started shutting down by itself again. When it started, the HP logo appeared and just stayed there, nothing went on next. Some other times, the HP logo screen had many vertical lines on the monitor.
The next thing I would want to try is to replace the PSU or motherboard.
The computer is 4-5 years old, however, I still want to save it. Is there any idea of how to fix, please help. Thank you very much.