So I decided to upgrade the RAM in my Yoga 11s. Switched off and unplugged my laptop. Earthed myself to unpainted radiator pipework. Got access (eventually - RAM is hidden under the keyboard). Normally I'd take the battery out and then press the power button to drain residual power, but the battery isn't external. Prised the RAM clips apart with a pair of screwdrivers, but made contact with the circuit board and got a spark. Now it won't switch on. No power lights, no nothing. Okay, so maybe I shouldn't have used an all metal screwdriver, but I feel like I'm missing something else too. Grateful for any help that stops me doing this again.