Computer freezes on BIOS screen after rebooting

[awshirley]

I'm running the latest version of Centos 7, fully patched, on my Dell Optiplex 990.  When I do a restart, the computer does a shutdown and immediately brings up the BIOS screen.  It draws the blue line across the bottom and just sits there.  I have to manually power it down, power it back up and then it boots fine.

Any suggestions as to why it freezes during a reboot?

[ron7000]

have sata set to AHCI in bios, try unplugging all sata cables except for the one going to your one disk having centos on it, and in bios set the boot priority to list only that one disk in position #1 (don't check dvd drive first then disk although dvd drive will be unplugged so should not show up). And of course review the bios version you are running, and consider updating it to the latest.

https://www.dell.com/learn/us/en/04/sha ... -sheet.pdf

The premier OptiPlex 990 is Dell’s most powerful and flexible desktop solution designed for...

maybe it's too powerful?

[TrevorH]

Remove 'rhgb quiet' from the kernel command line in /boot/grub2.grub.cfg so that you get rid of the stupid blue line altogether and actaully see what the kernel is doing when it boots.