I've built quite a few, and this one was working fine for several months - and no recent changes. Suddenly, it won't boot at all. No POST, no beeps, no signal to the monitor. The Power light comes on, the fans run, the HDD starts up, the CDROM light comes on - but that's it.
I disconnected various things, first externally, then internally, to see if I could get any beeps at least. No difference, even if the only thing still connected to the motherboard was the processor - and power, of course, plus the case speaker, which used to give me the customary short beep when booting.
I put in a POST diagnostics PCI card at some stages, and it always showed a steady "00" - nothing else.
So, it must be either the PSU or the motherboard, right?
With power applied but the system off, I get these voltages at the 24-pin connector:
green 5.05V
purple 5.06V
gray 0V
A few seconds after hitting the Power button, I get:
green 21.7mV
purple 5.06V
gray 4.98V
Various other colors give me a fraction of a millivolt with the system off, then with the system powered up:
blue -11.56 V
yellow 12.16 V (also on the 4-pin connector)
red 4.98 V
orange 3.397V
These readings are all with motherboard, CPU, RAM, HDD, FDD, CDROM, fans connected, plus power button and light, speaker, HDD light.
I don't run wires under the motherboard, and always check for the possibility of shorts when originally installing it, so have not breadboarded it. This is a very straightforward PC for my wife's use, not overclocked, no exotic hardware!
One thing I have not done is to clear CMOS. In its current state, the keyboard if connected can still be used to wake up the system. I raised a query on Gigabyte's website a week ago and they have still not even acknowledged it, let alone read it. So - I'm your hands, guys, please.
You'll want to know a bit about the system, I guess, so here are the unexciting essentials:
MB: Gigabyte GA-P31-ES3G Rev 1.0 (45nm, FSB 1333, DDR2 1066)
BIOS: ah, I can't see that, because... (you know the rest)
Processor: Intel E1200 (dual-core Celeron) LGA775 1.6GHz
RAM: 1GB Crucial (2x500MB, each CT6464AA667) PC2-5300 unbuffered, non-ECC, 240-pin, 8 chips
Graphics: PowerColor AX3450 256MD2-S (ATI Radeon 256MB 64bit DDR2, passive cooling)
PSU: Silver Power 500W, model SP-SS500
HDD: Seagate 7200.12 SATA 250GB ST3250318AS
All relevant bits (MB, RAM, PSU, processor) were brand new, mostly this year, a couple a bit older; case is an older Supermicro.
Have I done enough checks on the PSU to eliminate it? Can I incriminate the motherboard and RMA it? Anything else I should have tried (and tell me why)? Any questions?
I disconnected various things, first externally, then internally, to see if I could get any beeps at least. No difference, even if the only thing still connected to the motherboard was the processor - and power, of course, plus the case speaker, which used to give me the customary short beep when booting.
I put in a POST diagnostics PCI card at some stages, and it always showed a steady "00" - nothing else.
So, it must be either the PSU or the motherboard, right?
With power applied but the system off, I get these voltages at the 24-pin connector:
green 5.05V
purple 5.06V
gray 0V
A few seconds after hitting the Power button, I get:
green 21.7mV
purple 5.06V
gray 4.98V
Various other colors give me a fraction of a millivolt with the system off, then with the system powered up:
blue -11.56 V
yellow 12.16 V (also on the 4-pin connector)
red 4.98 V
orange 3.397V
These readings are all with motherboard, CPU, RAM, HDD, FDD, CDROM, fans connected, plus power button and light, speaker, HDD light.
I don't run wires under the motherboard, and always check for the possibility of shorts when originally installing it, so have not breadboarded it. This is a very straightforward PC for my wife's use, not overclocked, no exotic hardware!
One thing I have not done is to clear CMOS. In its current state, the keyboard if connected can still be used to wake up the system. I raised a query on Gigabyte's website a week ago and they have still not even acknowledged it, let alone read it. So - I'm your hands, guys, please.
You'll want to know a bit about the system, I guess, so here are the unexciting essentials:
MB: Gigabyte GA-P31-ES3G Rev 1.0 (45nm, FSB 1333, DDR2 1066)
BIOS: ah, I can't see that, because... (you know the rest)
Processor: Intel E1200 (dual-core Celeron) LGA775 1.6GHz
RAM: 1GB Crucial (2x500MB, each CT6464AA667) PC2-5300 unbuffered, non-ECC, 240-pin, 8 chips
Graphics: PowerColor AX3450 256MD2-S (ATI Radeon 256MB 64bit DDR2, passive cooling)
PSU: Silver Power 500W, model SP-SS500
HDD: Seagate 7200.12 SATA 250GB ST3250318AS
All relevant bits (MB, RAM, PSU, processor) were brand new, mostly this year, a couple a bit older; case is an older Supermicro.
Have I done enough checks on the PSU to eliminate it? Can I incriminate the motherboard and RMA it? Anything else I should have tried (and tell me why)? Any questions?