Proxmox VE

How to Fix BIOS Boot Issues - Complete Troubleshooting Guide

2 min read

How to Fix BIOS Boot Issues - Complete Troubleshooting Guide

Question: My VM won’t boot - how do I fix BIOS issues?

Answer: Systematic troubleshooting

Problem: VM Boots to Black Screen

Possible Causes

  • Boot order wrong
  • No bootable disk
  • BIOS not configured

Solution 1: Check Boot Order

# View current boot order
qm config 100 | grep boot
 
# Set boot order
qm set 100 --boot order=scsi0

Solution 2: Verify Disk

# Check disk exists
qm config 100 | grep -E "scsi|sata|ide"
 
# Add disk if missing
qm set 100 --scsi0 local:32

Problem: “No Bootable Device”

Solution: Configure Boot Device

# Set boot to disk
qm set 100 --boot order=scsi0
 
# Enable disk
qm set 100 --delete boot
qm set 100 --boot order=scsi0

Problem: DVD/ISO Not Booting

Solution: Check Boot Order

# Add ISO
qm set 100 --ide2 local:iso/windows.iso,media=cdrom
 
# Set boot to CD
qm set 100 --boot order=ide2
 
# After install, change boot back
qm set 100 --boot order=scsi0

Problem: UEFI Boot Fails

Solution: Reinstall EFI

# Remove old EFI
qm set 100 --delete efidisk0
 
# Add new EFI disk
qm set 100 --efidisk0 local:1G
 
# Set boot order
qm set 100 --boot order=efidisk0

Problem: PXE Boot Not Working

Enable Network Boot

# Enable network boot
qm set 100 --boot order=net0
 
# Check network config
qm config 100 | grep net0

Problem: Boot Loop

Solution: Check Boot Files

# Check disk content
pvesm list local | grep 100
 
# Verify boot files
ls -la /var/lib/vz/images/100/

Keywords

boot-issues troubleshooting bios how-to fix

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