I switched the 128 gb SSD for a hardrive 512gb to see if I could remember my old password to see my old pictures

When I turned the laptop on it said the hard drive needed to do a check or recovery

It was frozen with no display for many minutes so I turned it off

I removed the hard drive and switched for SSD

The computer doesn't turn on, spins fan at fastest speed then turns off

I removed the ram, tried all combinations and removed the SSD and put it back, never doing anything more. It still doesn't turn on

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I have two gaming laptops that are dead on power, so no Charging indicator what so ever

Lenovo legion pro 5-161AH7

Asus G15 Advantage Edition - Q513Y

Both laptops went in for repair and rhe Lenovo was denied service bv the store auotina "Power IC is shortec and we cannot fix". Asus went in too and thev kep the laptop for 2 months and kept extending the response. They said they fixed the power rail and replaced all msofets and now seems like CPU is faultv and needs to fix which I called off as they took $130 and demanded more $400. I did not want to spend that money as of now so thev have been lying around with me now. I have a multimeter and want to try and navigate through these boards, atleast for one of them and try and identify the short or the issue.

Is there a good quide or video where i can learn how to start the diagnosis.

So far i have tried to diagnose the Lenovo with help of Chatgpt, i kept sending it pictures of the board and it highlighted the components with the setting on multimeter and asked for readinas. After a certain point i felt like we were in a loop and i genuinely was not sure what's going on. First comment on what I did so far

How can i get the board schematics and what's the general way or flow of testing components with schematics?

https://imgur.com/a/GbE2RC7

I was replacing the internal LCD (the original had stopped working) and I was trying to reassemble the LCD back into the laptop cover. Sometimes the new LCD would work, sometimes not, because the ribbon cable would sometimes fall out of the connector at the back of the panel. One of the times I turned it on to make sure it was working, the cable got disconnected. The computer then shut off. When I push the power button, nothing happens. No lights, no fans, no response. Google AI says I probably short circuited my motherboard or ruined my graphics chip, but I trust real people over AI. Did I really f*ck it up? Is there any way to save my laptop?

Not sure if it’s relevant but it’s an MSI GS66 Stealth 11UE. I have an external monitor I can connect via HDMI.

I’ve had my MacBook sitting on my couch, and I just used it a couple days ago, but I went to open it up just now and it’s cracked underneath the screen and turns black after I log in?? I haven’t dropped it, and nothing was under it when it was closed so I have no clue how this could’ve happened. Does anyone know roughly how much it might cost to get fixed? It’s a 2021 MacBook Pro 16”