I see this every so often when upgrading DELL PC Memory, I get the message
O S Install mode enabled. Amount of available memory
limited to 256MB. Strike the F1 key to continue. F2 to run the setup
utility.
To fix this simply press F2 and scroll down to OS install mode and press space bar once to turn off os install mode, press Esc to exit, saving the changes you made, this will restart the system and the whole amount of RAM will be available. Dont forget to go to control panel--system--advanced tab----performance click settings then click advanced then click change then check the system managed size circle then click the set button then click OK, then OK again and click OK once more, restart the PC and you will notice a performance increase with the new RAM.
