PC won't turn on after hw upgrade

schloegi

Honorable
Jun 8, 2013
3
0
10,510
Hi, I recently upgraded my HTPC and now it will only turn on sometimes, the other times, nothings happens, no fans spin up, no post, nothing.

Before the upgrade my PC consisted of the following components:
- Antec ISK 300-150
- Asus P8H67-I Deluxe
- Intel i3 2120
- Corsair DDR3 4GB 1333 Mhz So-dimm
- Crucial M4 256 SSD

The PC was working normal and it would turn on everytime.

I upgraded my PC with the following parts:
- Fractal Design Node 304
- Silverstone SST-ST55F-G Strider Gold Series - 550 Watt
- EVGA GTX 670 FTW Signature 2
- Hitachi 2,5' HDD 256GB

The other parts stayed the same (except for the Antec case which was replaced by the Node).

I was pretty happy with my build, until it didn't turn on. I tried to disconnect it from the power outlet for a few minutes, let the capacitors discharge, nothing helped.
After a few tries the PC would suddenly start. Also sometimes it would start with a few seconds delay,
after hitting the power button.

If the pc decides to turn itself on, it will run with no hiccups and no blue screens (tested it with a few hours gaming session).

Also I checked the motherboard, the green led is glowing so I'm suspecting the graphics card or the psu.

Any other ideas or suggestions that could help me figure it out?
 

schloegi

Honorable
Jun 8, 2013
3
0
10,510
So you think it's not that the psu is damaged or broken but rather just underpowered for my setup?
I looked up my Silverstone psu and it has +12V: 45A, whereas for example the XFX P1-750S-NLB9 has +12V: 62A.
Would that be enough?
Also for future pc builds, how could I tell if a psu is right for my planned setup, most reviews from my components I read were just mentioning watts and never Ampere.