I just got a used HP ProLiant DL360e Gen8 and the cache was bad on the P222 raid card in it. The people I bought it from sent a new cache and battery.
I added it today and now it says cache for smart array p222 in slot 1 is not configured. But the green light is on the cache so it's got power. And the system sees it.
The only thing I can find says the battery is bad. But the light is on so I don't think that's it.
I checked every setting and ready 50 pages deep in Google.