Recently my PC would sometimes refuse to start on first try. I pushed the On-button – nothing happened (no fans, etc., just dead) – pushed again, again, and then it started as if nothing was wrong. Most of the time it just started right away.
Now it simply doesn’t turn on anymore. Suspected a faulty On-button, checked the switch with a multimeter, bridged the pins on the MB, even bridged the 24-pin power connector – nothing.
Optimistic as I was I started removing single components to see if they caused a problem, after making no progress I breadboarded it.
PSU seems ok when trying to start it isolated by bridging on the 24-pin. The PSU fan turns, as do any directly connected case fans, and even the GPU fans turn when the 8-pins are connected to the card. The voltages seem good enough: 3,48V – 5,25V – 12,22V. The 3,3V is slightly above the 5%, but that shouldn’t be too dramatic I reckon?
The moment I plug the PSU into the MB however, it doesn’t do anything at all. Tested various combinations of components on the breadboard setup (with or without graphics card, RAM sticks, etc.) but none allows the PSU to go active.
That the PSU refuses to work when plugged into the MB looks to me like a kind of short-circuit, but then it's weird that it still worked at first and now not at all.
MB looks to be in good condition otherwise, can’t spot any blown capacitors or alike.
CMOS Battery is still good too (checked with multimeter and also replaced with another out of sheer desperation)
CPU[strike] I didn´t really check yet, as I don´t have thermal paste laying atm to reassemble it[/strike]. CPU.. is checked, looks good.
So.. my suspects are of course PSU, MB or CPU.
I don´t have a replacement PSU laying to test with, the only alternative power source is a ready-made desktop PC, whose fix built-in PSU has only a 4-pin processor power plug, whereas my MB requires an 8-pin, which to my knowledge is required to make it work?
Does anyone have an idea what it could be, or what further tests I could do to narrow the problem down (short of tossing a coin which of the 3 to buy a replacement for first)?
The specs (whole system ran like a clockwork for years):
PSU – Be Quiet! E6-500W
MB – Gigabyte GA-EP35-DS4
CPU – Intel Core 2 Quad Q9550
RAM – 2x Kingston HyperX 2GB, 2x Corsair Dominator Twin2X
GPU – Gainward GTX 570 Phantom
Now it simply doesn’t turn on anymore. Suspected a faulty On-button, checked the switch with a multimeter, bridged the pins on the MB, even bridged the 24-pin power connector – nothing.
Optimistic as I was I started removing single components to see if they caused a problem, after making no progress I breadboarded it.
PSU seems ok when trying to start it isolated by bridging on the 24-pin. The PSU fan turns, as do any directly connected case fans, and even the GPU fans turn when the 8-pins are connected to the card. The voltages seem good enough: 3,48V – 5,25V – 12,22V. The 3,3V is slightly above the 5%, but that shouldn’t be too dramatic I reckon?
The moment I plug the PSU into the MB however, it doesn’t do anything at all. Tested various combinations of components on the breadboard setup (with or without graphics card, RAM sticks, etc.) but none allows the PSU to go active.
That the PSU refuses to work when plugged into the MB looks to me like a kind of short-circuit, but then it's weird that it still worked at first and now not at all.
MB looks to be in good condition otherwise, can’t spot any blown capacitors or alike.
CMOS Battery is still good too (checked with multimeter and also replaced with another out of sheer desperation)
CPU[strike] I didn´t really check yet, as I don´t have thermal paste laying atm to reassemble it[/strike]. CPU.. is checked, looks good.
So.. my suspects are of course PSU, MB or CPU.
I don´t have a replacement PSU laying to test with, the only alternative power source is a ready-made desktop PC, whose fix built-in PSU has only a 4-pin processor power plug, whereas my MB requires an 8-pin, which to my knowledge is required to make it work?
Does anyone have an idea what it could be, or what further tests I could do to narrow the problem down (short of tossing a coin which of the 3 to buy a replacement for first)?
The specs (whole system ran like a clockwork for years):
PSU – Be Quiet! E6-500W
MB – Gigabyte GA-EP35-DS4
CPU – Intel Core 2 Quad Q9550
RAM – 2x Kingston HyperX 2GB, 2x Corsair Dominator Twin2X
GPU – Gainward GTX 570 Phantom
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