My lenova won't turn on just has flashing white light. I updated origin shut it down & next day won't come on plugged in
Since I purchased it 9 months ago the longest the battery last only 2 hours before having to plug it in.
Computers & Internet - Lenovo
Answers & Comments
I found these places for you its only info but it may help you out.
https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T420s-No-power-blinking-power-Led-won-t-boot/td-p/684845
or
Computer Won Turn On Only the Light