My HP turns on but only shows a black screen.

Now before I get into here are the solutions I have tried:

•I have tried turning it off and unplugging all power source and holding the power button. No reaction.

•I have tried pressing windows + b and got my caps lock button to flash continuously.

•I have tried taking out my memory cards and putting them back in.

•I have also tried taking out the battery, charging it with just the charging cable for an hour and a half and then restarting it to see if it just needs to heat up.

•I have tried blowing on the back.

•I have tried pressing on the keyboard while turning it on just in case something was loose.

Now let's get to it!

My laptop was fine last night. I turned it off. Went to work cme back and boom. It wont turn on. But the caps and the number lock blink 3 times in a row. 5 times each.

It turns on but it doesn't heat up I've replaced the charging cable to check that problem I've even gave it a love tap or five but nothing it working.

I've heard it's a CPU problem but what the heck is a cpu?? Why cant I find anything to fix it?