New Computer not powering on,is it because of not powerful enough PSU?

So today I bought my self parts to build a new computer for my parents, here are the parts:
A10-5800K
Gigabyte F2A85XM-D3H
Cooler master elite 342
Kingston 4GB DDR3-1600
Western Digital 1 TB blue Sata3
And the power supply im not sure but its a 420W PSU that came with the case, I think its quite low quality but as it came with the case i thought i would just go with it

So when I assembled everything, it didn't start up and the lights just flickered, Then I Connected the Power + and Power - pins together with a screwdriver and the CPU make kind of quiet clunking noises and the PSU fan spun for a brief sec.

Is this caused by not having a PSU powerful enough or is this probably some other reason? though a online wattage calculator says i only 240W for this system :/

If its the PSU Im thinking of getting a Cooler Master GX 550W 80+ Bronze

My bet is that the PSU is the culprit because the PSUs that come with these cases are utter crap. I apologize for the way I said that, but I don't know of any other way of saying it right now.

The Cooler Master GX Bronze Series units aren't bad; they're not great, but they're actually somewhat decent. Of course, you can do better than the 550W GX Bronze Series.

As long as the PSU is working, it should be more than enough for that system.

I hope that you meant that you bridged the pins on the front panel header. (That's a legitimate way of checking for a defective case power button.)

Did you connect the 8 pin (probably 4+4 pin) 12V CPU power connector? (Just guessing at random here.)

well yea... the power supply seemed to be defective as in really defective... when I bridged the pins the 4th time the power supply just blew up, literally, thanks for all your help here

by power+ and power- i mean the ones on the motherboard in which you plug the F Panel on switch into...

bobafetthotmail said:

As far as PSUs anything that has the 80+ certification is fine. It means that they are tested and can reach and keep 100% of their stated capacity without dying horribly. For a general-use PC you don't need more than that.

I'm sorry, but this is not true. There are 80+ Certified PSUs that are utter garbage and should be avoided.