This should have a different reason. I’m running it on a ThinkPad from 2009 with similar specs without dedicated graphics. It works fine, even multiple instances in parallel.
Rather than send the Lightburn file to the laptop, just send the GCode file to it. Then you can use a GCode sender program to feed it to the laptop. Of course, this eliminates the ability to make last-minute changes to the project.
Is the hard drive nearly full? Does the PC have USB 2.0 or higher ports? What BIOS does the machine have? I cannot think of anything else it could be.
Thank you very much for your answers!
Antivir “detected” many Lightburn files as some kind of Trojan horse, so it blocked Lightburn and I didn’t see any notification about that. I guess Antivir is wrong (didn’t get updated since 2014). So it’s all good now Thank you again!