Hello,
If there are no errors on IML and all other hardware components shows OK on ILO, you can try one of below steps
> update server bios to latest if old
Type: BIOS (Entitlement Required) - System ROM
Version: 2018.05.21(A)(6 Jul 2018)
https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_cdac009824154b27b3b3637a69#tab1
> or switch to backup ROM in RBSU and check status