Solved! Power on Then Off Dell 6430s

May 19, 2021
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Hi, i have Dell Latitude E6430s power on for a while then Off.
Power Led Light turn on and Heatsink Fan run fast for 3,4 second..
it was working laptop i was trying to boot from usb flash drive to install
MacOs in This laptop but it was not booting and nbot going to start MacOS
Installation.so i keep trying and restarting again and agian after 4 or 5 try
it happened like this just on then off.
Please anyone help me.
tried unplug battery and bios Battry and press &hold power button for 90sec
tried unplug all I/O devices like keyboard cd rom Mouse pad strip etc.:unsure::unsure:😔