Tbh the donator info should be more clearer in your defense, but on the other hand $5 should not entitle you to rock up to trips and loot free shit.
You can't donate $5 and loot >$5 in GP and hope to turn a profit.
stats are fine, you can do it on level 40-50 accounts pretty easily.
google setups
youtube guides on positioning to save supplies / killing jad with little effort.
Very hard to tell based on a post.
Most "experts" will do what most mechanics do, trial and error parts and attempt to charge you labour each step of the way e.g. power cord, new CPU, new this, new that.
Unsure if there are diagnostic tools that can be run when PC is off, you can probably still recover the HDD/SDD (hard drive).
Is the PC old?