T510 boot issues - power button flashes

I have a T510 that is acting really strange.
The laptop will do the following once shut down for any extended period of time.
When I open it up and press the power button the power button, keyboard light , hdd light will all flash. 5 seconds or so will pass and then it will do the same thing, never actually booting up. I'll pull the power and batteries and repeat the process and the thing will do the same thing. Eventually it will boot if I repeat the steps enough.
This just started happening recently. It will run fine once the system actually turns on. I have updated all drivers, I have updated the BIOS and all other software. I am highly doubting this is a windows issue as it never even POSTs.
The flashing lights almost act like an error code but I couldn't find anything regarding 1 quick slow flash by the power button.
Any suggestions?

Maybe the keyboard cable or the keyboard itself? Nothing shows on screen during a false start?
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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