[SOLVED] I built my first computer and when I turn it on it flashes and turns right back off.

[Cabezilla]

I built this computer and I am honestly not sure if I hooked up all the wires. I am not sure but when I turned it on the first time everything kicked on and there was no visual and I saw that my graphics card was not on. I connected it and then still nothing, I find that the hard drive was not connected and I plugged it in and when I tried to turn it back on it flickers once and it cuts off. Any help would be appreciated.

 

[Mahzin]

The screws are very hard placed or loose? I already made the mistake to make it so hard, forcing the mobo that it didn't turn on, so I loose the screws and vuala! Which PSU do you own? You connected correctly the hear pannel? Tried to switch between memories to see if one is fault or if one bank is broken? Your CPU cooler is so heavy? If yes, it uses a backplace below? Large coolers can sometimes damage the motherboard circuits as I listened from a specialist, since it's the gravity law.

 

[Vic 40]

Something you can check the system by,

"No POST", "system won't boot", and "no video output" troubleshooting checklist

"No POST", "system won't boot", and "no video output" troubleshooting checklist This checklist is a compilation of troubleshooting ideas from many forum members. It's very important to actually perform every step in the checklist if you want to effectively troubleshoot your problem. 1.Did you...

forums.tomshardware.com

read the motherboard manual as well, keep it next to you when checking connections and other stuff.

What parts used? All parts, psu as well, for psu=maker+model+wattage.

Maybe make some photo's and post here,

You can use Imgur to post a picture here,use the "img" link.
Click "new post" ->choose "upload images" -> "browse" ->choose the picture and click "open" ->put cursor on the picture that you uploaded->choose "share links" and copy the img link,paste it in your next post.