Thinkpads Forum

Hello, yesterday I decided to open up my ThinkPad to clean it and maybe install Usb-C PD in it (which in the end I didn’t do, since the module was too big), but now it doesn’t power on, the only sign of life I see is when I plug in the charger, and the battery LED blinks in this pattern: 4 blinks (stops for a bit at the fourth one) and then one blink.
What should I do? I already tried removing RAM, putting only one in, different slots, resetting CMOS by pressing the power button for 30 seconds, plugging the charger in without battery etc etc…

Fixed it!
For anyone wondering, if nothing works it’s probably the touchpad’s connector (the one in the center, just above the trackpad), I removed it and was able to enter POST, but I’ll have to replace it soon, since without it some of the keys on my keyboard stopped working (like Enter, Esc, Backspace, Cancel and the H key).

You mean that the touchpad is somehow causing an electrical fault that prevents the laptop from powering up? That's new, but not implausible.