I get this error message on my Dell Insperon 5150 Manufacturing Mode level (67) Press Fn-X with a black screen!

But when you press FN-X nothing happens? I think this is a bios problem but have no idea of how to solve. Any ideas?????

I have exactly the same problem so would be good to find out what caues this and how it can be cleared.

Internet searches suggests that its a diagnostic mode and that it needs dell to reset.

There are many varied fixes to that problem.

Usually, Fn + X resets it.

Sometimes, going into the System BIOS setting and resetting to the defaults can fix it (Alt + f)

Sometimes a motherboard change will fix it.

Sometimes a BIOS upgrade will fix it.

Unfortunately, sometimes none of the above will fix it.

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A notice to ALL - not related to this post.

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Please do not use DCF Messenger to ask me questions about your system.
Find the correct forum that relates to your issue and post the question there.
You will get a quicker solution to your issue.

if a system is stuck in manufacturing mode, it might suggest a motherboard failure