Flash Sale:75% Off Hosting + Free DomainEnds in13h47m14sView Plans
Hostvento logoHostvento
Get Started

What to Do About the Illegal OpCode Red Screen

Some HPE ProLiant physical servers show a red screen with the words "Illegal OpCode" when they start. This guide gives safe first steps and tells you when to ask for help.

How-To Guides2 min read9 steps1 screenshots

What does the error mean?

An opcode is a tiny instruction that the computer chip follows. "Illegal OpCode" means the chip got an instruction it could not understand. The server stops and shows a red screen. People call it the red screen of death.

Screenshot: An opcode is a tiny instruction that the computer chip follows. "Illegal OpCode" means the

It often points to a problem with the server's firmware. Firmware is the built-in software that starts the hardware. It can also come from bad memory or a failing part.

This applies to physical servers you can reach yourself. If your server is a Hostvento service, contact Hostvento support first. Do not open any hardware.

Safe steps

  1. Write down everything on the screen. A photo with your phone is best.
  2. Check for any other message, code or flashing lights on the front of the server.
  3. Do not press keys at random.
  4. Restart the server once with the power button. Hold it for the normal shutdown, wait a few seconds, then turn it on again.
  5. If it boots, back up your data at once. The fault may return.
  6. If you recently changed anything, such as adding memory or a card, note it. Undo it only if you know how to do so safely, with the power off.
  7. Check the server's management tool for hardware alerts. HPE servers often have a built-in one called iLO. You need its address and login from whoever set up the server.
  8. Look in its log for errors about memory, power or the chip.
  9. Check if the maker has a newer firmware update for your model. Only install updates by following the official steps.
Tip: Never switch the power off in the middle of a firmware update. That can make the server unusable.

When to contact Hostvento support

  • The red screen comes back after a restart.
  • The server will not start at all.
  • You see memory or hardware warnings in the log.
  • You are not sure about any step.

Open a ticket at https://secure.hostvento.com/submitticket.php. Include your photo, what happened just before, and any recent changes.

Quick recap

  • Illegal OpCode means the chip got an instruction it could not read.
  • Photograph the screen and write down details.
  • Try one calm restart and back up your data if it boots.
  • Check hardware logs and firmware, with care.
  • Contact Hostvento support if the error returns.