Getting frustrated with non working PC

gibbingslfc · 13 Jun 2014 at 13:15

Ok I've already started a thread once but that was a few days ago so I thought i'd start fresh. Long story short my machine stopped starting up a few weeks ago and since then I've done the following:

Replaced motherboard
Done paperclip test on PSU and the fan started up fine.
Ran with motherboard out of case to check for shorting and still got nothing
Tried using screwdriver on power pins on the motherboard to rule out a faulty power button
Removed CMOS for 15 minutes, put it back and still got nothing
Tried using one stick of RAM in each slot one at a time
Used spare memory and did same
Replaced CPU
Moved the whole thing to new case and did everything above.

I've been doing all this without any HDDs in and without a graphics card in and one fan plugged in, the lights on the motherboard light up when theres power going into it but the fans wont spin up at all. I'm getting very very frustrated with this whole thing now and I don't know what else could be wrong.

Specs:
Corsair HX 650W PSU
Intel i5 2500K (SandyBridge) CPU - Replaced with intel Celeron G1610 2.7GHz (Ivybridge) Socket LGA1155 Processor

Asus P8P67 Mobo - Replaced with P8Z77-V
HD 7970 VAPOR-X GHZ 3072MB GDDR5 PCI-Express Graphics Card
Corsair Vengeance Low Profile 8GB (2x4GB) DDR3 PC3-12800C11 1600MHz Dual Channel Memory Kit (CML8GX3M2B1600C11)
Samsung 250GB SSD 840 SATA 6Gb/s Basic - (MZ-7TD250BW)

stulid · 13 Jun 2014 at 13:25

The PSU could still be dodgy, it may start up when you do the paper clip test but what if the voltages are way out of spec.

From reading that all you havent tried is a new/different PSU and a known working stick of RAM as they to could have died, but thats less unlikely for both to have gone at the same time.

gibbingslfc · 13 Jun 2014 at 13:30

stulid said:
The PSU could still be dodgy, it may start up when you do the paper clip test but what if the voltages are way out of spec.

From reading that all you havent tried is a new/different PSU and a known working stick of RAM as they to could have died, but thats less unlikely for both to have gone at the same time.

Right, I thought that if the paperclip test worked then the PSU was all good. I'll get onto some friends and try a spare PSU then.

IronWarrior · 13 Jun 2014 at 16:23

If you replaced everything, then PSU is the problem.

wazza300 · 13 Jun 2014 at 16:27

mightymouse · 13 Jun 2014 at 17:15

if you can get your hands on a multimeter then testing each of the plugs could help you identify if it is the psu. also another one that i keep suggesting is cpu paste. from experience too little and the pc doesnt start up too. also becareful not to bend the pins when installing the cpu.

gibbingslfc · 13 Jun 2014 at 18:46

mightymouse said:
if you can get your hands on a multimeter then testing each of the plugs could help you identify if it is the psu. also another one that i keep suggesting is cpu paste. from experience too little and the pc doesnt start up too. also becareful not to bend the pins when installing the cpu.

How does it know how much thermal paste is present? I'm 95% sure without the paste the CPU would just get gradually hotter.