I am new to Ubuntu on the desktop - though I've used Linux on servers for years. Finally ditching Windows. I have successfully installed on laptop. Now I'm doing my desktop. I have an HP Eny 700 PC.
I logged into BIOS and switched boot order. I rebooted to USB flash drive. I installed 19.04. I erased and installed to my HDD. All worked - until reboot.
After reboot, Ubuntu did not boot. And I could no longer access BIOS. Basically, my system is DOA. There probably aren't hardware errors. But I'm trying to clear BIOS by bleeding battery power. Any ideas. BTW, I'm checking previou answers. Nothing found - thus far.