HPU won’t boot up

For the last couple months it’s taking me about 10 power cycles to get my HPU to boot up.
I have 2 of them. Same behavior on both.
Sometimes it shows a high end logo.
Sometimes a high end logo then the 4 in the circle logo.
Sometimes it’s says “starting console”.
It ALWAYS ends in a blank screen with a cursor blinking in the upper left.
I’ve tried to boot in to the bios with delete key or F2.
No luck. Same result.

This isn’t the behavior described in other bios battery posts.

Now one of the hpus won’t boot at all. Just the blinking cursor upper left.

Anyone got an idea?