LENOVO G400 TURN OFF AUTOMATICALLY AND NOT LOAD BIOS SETUP

i have a lenovo g400, once i turn on it only the lenovo name appears in the screen and then it turn off automatically and then turn on and turn off again and so on... also I was having problem that my Lenovo G400 laptop did not display Press F2 to Enter Setup during the boot process, and because of this, no amount of hammering the F2 button would allow access to the BIOS. I attempted all of the standard fixes, pulled the battery, held power down for 30 seconds, removed the HDD -- nothing would cause this to appear. i dont know whats the problem of my laptop..please help me to fix it..

hi PRAY2431,
Welcome to the Lenovo Forums.
Can you try to access the BIOS by pressing the OneKey Recovery button.
- Link to picture
If you manage toget in, try prssing F9 to reload factory defaults then press F10 to save and exit (this should reset the hardware configuration of the machine).
If you still can't get into the BIOS and the machine still turns off after POST (lenovo screen) then there's likely a hardware component that's failing. If you have a spare PC, try to create a Lenovo Bootable USB Diagnostics and boot from it by pressing F12.
Alternatively, you can contact Lenovo (for service) or contact one of the Lenovo Authorized Service centers below
Service Provider List (Philippines)
Regards
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