1: no options inside told.2: no CMOS COIN cell ever lasted 13 years, so id dead3: now BIOS is in CHAOS mode. dead battery caused,4: new coin cell,.5: reset bios to factory fresh defaults in BIOS page 1.6: set time and date in bios.7: set boot order or your boot drive or raid array based on #1 above secret.8: load Server 2012R2 is best here . or linux or what is in the list .if using raid it must be tested first the array under the raid controller. path. depends on what is there, not told.a dead server can be accessed via, IMM like my dell DRACit has page called logs to read.Id read them. (opps it flags coin dead , see?)_IMM (remove manager) , READ THE LOgs , remotely.>?? first?AND SEE LAST BOOT DEVICE./? (and what)????????????????new coin cell and ....THEN SET BIOS BOOT ORDER TO CORRECT BOOT DEVICE?got raid?1 raid or more.1 for boot?1 for data.???????????????????????????? look inside yet see what is there, even count all disks see where all connect . to what.run the raid config, some servers have raid support DVD or uSB stick to boot and manage the arrays/, but what is inside matters firstsome have upgraded LSI raid cards and that matters most if there, ? day one new had 7 cards as an option. (just with IBM alone)there are MORE. LSI makes great RAID cards, Got raid?The System x3400 M3 server supports optional spare DIMMs, memory mirroring, and RAID-0, RAID-1, and RAID-1E support standard with optional RAID-5, RAID-6, RAID-10, and RAID-50 availablemost servers like this the built in raid is weak , not allowing raid 6 mode.so that matters too if that was done day1, last time.https://lenovopress.com/tips0808#standard-specifications
the manual is here (lenovo says EOL, zero help)https://www.ibm.com/support/pages/installation-and-users-guide-ibm-system-x3400-m3-7378-7379I anm not any kind of IBM guy. (data centers)but have Dells here, and can work them wellIMM find and read all logs carefully,most servers logs what disk drive last booted OKAY. explicitly/and how to open the case and learn what is inside first. for sure all things RAID.