RE: Vostro 230 - display randomly goes to sleep
Please run the diagnostics on the system ( Restart the system and start tapping the F12 key. Then select Diagnostics and press the enter key, go through the on-screen prompts). Let us know the status, if there is any errors. Also test the system in safe mode, monitor the in BIOS and check if the system powers off. Check the monitor on another system and let us know if the screen goes blank.