Replying to My fucking Computer is broken i need help

Ok so when i turn on my computer, i turn on my monitor, and the monitor just says 'no signal' like its not plugged into the computer but i have checked 700 times it is and it is tight, the cord is ok, they both have power i cleaned the lil ports with one of those waterless electronic cleaner cans u know pretty much just compressed air, but idek what the fuck is wrong. Got any ideas?

That was one giant run on sentence. hahah oh well
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'liberals think killing babies can be both fun and profitable, while conservatives think killing foreigners can be both fun and profitable'-Ice-is-scary

^^^^That is the textbook difference between Liberals and conservatives