Laptop Failure

Last night, I cleaned my laptop thoroughly by removing all the dust and cleaning the components (including the GPU and CPU) with cotton swabs and isopropyl alcohol. I also used a toothbrush with isopropyl alcohol to clean the casing, and occasionally used it on the components. However, I only used the sides of the bristles (never the tips) and did so gently to avoid scratching the components.

After the cleaning, I reassembled everything but left out the battery because it was starting to swell. I didn’t apply thermal paste because I didn’t have any. When I tried to power it on, the laptop turned on automatically as soon as I connected it to the power supply. However, the screen remained black with no display, and the fans started spinning at maximum speed without any progress.

I’m using a Dell Inspiron 15 5567. I’m really stressed about this situation since I need the laptop for work. Any help would be greatly appreciated!