Sorry - I've been away and off-line for a couple of days.
The simplest way to test your monitor is to connect it to a different computer, if you haven't got one take it to a friend's. If it works fine there, then it is definitely not the monitor. And the simplest way to check if you are getting any video output at all is to plug a known working monitor into the computer, even if it is only the BIOS screen that you get to see.
The fact that your power light is coming on, fans and hard drive are spinning, suggests that there is no problem with your power supply. That's a pity - they are reasonably cheap and easy to replace !
You don't say whether you are using an add-on/plug in video card or not. If you are, once you have a known working monitor attached to your computer, try using the on-board graphics to see if you get an output to the screen. Wiping a hard drive will not affect the operation of the BIOS except that it can't boot. You should get the BIOS screen and you should be able to get into the BIOS since the BIOS system is hard wired into chips on the motherboard.
At the moment, the first thing you need to do is make sure you have a working monitor connected, then if you still can't see anything we can worry about other possibilities.
And finally - there is no need to quote everything that somebody has posted in a reply ! If you look you will see that everything you have quoted is still there in the previous posts. By all means use quotes to pick out one particular point - as I did with "heard a click noise" - but it is seldom necessary to quote a complete post, it just clutters up the page.