I have the official PSU and it's connected to a brand new Raspberry Pi 3B+, I copied the official Raspbian on to an SD Card and inserted into Raspberry Pi 3B+, it ran fine on the first day, and I shut down using the drop down menu remotely using VNC, I didn't disconnect the power, now I wanted to turn it on, so I removed and inserted the plug at the outlet and it isn't showing anything on the monitor, the red light stays on, the green light sometimes flickers, sometimes it doesn't, even after reconnecting the power cord.
I ran fsck on the SD card using a card reader and everything came clean, so I'm at a loss about why this is not turning on.