The power save mode of the monitor is designed to conserve energy when there are no or limited signals coming through. Laptop users sometimes may need to use an external monitor for display purposes. When connecting the laptop to this monitor, the latter may keep switching to power save mode. The most common reason for this problem is a faulty connection; as a result, the monitor will not receive any signals from the laptop. The solution to this problem lies in correcting the connection issue by checking the connecting cable.
I am trying to connect my laptop to a monitor. The monitor was working fine with a PC when I last used it, a while ago. I have recently used the same laptop with another monitor, and that worked fine too. But those two together...the best I managed was to get the monitor to show me the laptop's desktop for 2 seconds before going back to safe mode.
Check the VGA cable, it might be loose.
Press the Fn key and CRT/LCD key (F5 or F6 depending on your laptop model) to switch the screen.