There's an error in the BIOS settings. Obviously not serious. It tells you on thge line above (on idiot configured machines it may be in quiet mode - you see a logo instead of messages - fix this fault in the BIOS too). Typically if you stick memory in a machine you have to enter and leave the BIOS cos the BIOS goes "Ohh, I ve got lots of memory - but my saved setting say I shouldn't have that much - better tell the user". You enter and leave and that saves the new amount. You can also tell the BIOS not to tell you (important if your keyboard breaks cos you can't press F1 - but if it doesn't wait for it you can boot up with mouse only)
Read your manual.