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Voltage Issues Causing Boot Problems

PowerMacG4

Limp Gawd
Joined
Jul 13, 2002
Messages
141
For some reason lately my computer has been having very much trouble when booting up after sitting off for a couple hours. Once the computer is up and running, everything is perfectly fine, but sometimes it can be a real pain trying to get the system to boot properly.

When booting I hear all my drives / fans that are on 4-pin molex connectors spin up and then spin down... and then I hear my hard drives / motherboard clicker / something go "clickclickclickclickclick".

At first I thought I was having hard drive issues, as the problem first manifested itself in my 80GB Seagate Barracuda IV. However, the problem quickly spread to all of my hard drives (40GB 'Cuda IV). I tested an unrelated drive (Maxtor 8GB) and after a few boots, it was exhibiting the same problems as well.

I quickly ruled out the hard drives as the source of the issue, so I cleared my motherboard's CMOS, which didn't help much at all.

Not having any idea of the problem, I decided to check my voltages.

My +5V line was wavering at around 4.3V!! This voltage was read within the BIOS. The other voltages were much closer, but all of them were generally lower than they should be.

The power supply I am using is an Antec TruePower 380W, and it has not exhibited these problems (to my knowledge) in the past. I believe the voltages have always been a little shitty, but not to this extent.

Another possibility is that my motherboard is somehow crapping out. I have an Asus A7N8X 1.xx board flashed to the 1004 BIOS. These problems first started to occur after I flashed to the 1007 BIOS, so I flashed back hoping to solve the issue. The motherboard hasn't given me any problem in the past, so I am doubting the possibility for the motherboard to only crap out on boot.

I have run some tests within Windows (it takes about 20-30 minutes for the computer to successfully boot... after that it is fine for that session)

badvoltages.png


The red circles are showing the same period of time. The +5V line fluctuates with CPU usage! I had heard my fans change speed according to CPU usage when my computer was changing from heavy to light to heavy load quite a while back, but I assumed that was a feature of the motherboard, or maybe PSU. However, "QFAN" or whatever it is called is disabled in the BIOS, and none of my fans are connected to the power supply's "Fan Only" connector.

I feel like I should buy a new power supply (from a different company) and maybe a new motherboard.

It has been quite a long time since I last looked at a good comparison of hardware (especially PSUs), so I am unsure of what exactly to purchase. I have my eyes on the Vantec line of power supplies, but I do not know how quiet they are. I am looking for a quiet power supply (my TruePower's fans barely make any noise at all), but with VERY stable voltages. I would rather have all of my equipment overvolted a little bit, than having all of my equipment be fighting over a strained power source.

The issue is not my RAM, or processor, or anything because once I successfully boot the computer, I can run test after test and benchmark after benchmark with no issue.

Thanks in advance for your advice.
 
Is your psu fan working? It could be a lot of differant things causing that.
 
Originally posted by Wixard
Is your psu fan working? It could be a lot of differant things causing that.

Yes.

Originally posted by TheMostWantedPolishTwin
specs? maybe it's time for a new PSU...

Antec TruePower 380W
Type: ATX
Maximum Power: 380W
PFC: No
Power Good Signal: 100-500ms
Hold-up Time: > 17ms at Full Load
Efficiency: < 68%
Over Voltage Protection: +5V trip point<+6.5V;+3.3V trip point<+4.1V;+12V trip point<+14.4V
Overload Protection: Latching Protection+5V @<47A;+3.3V @ <48A;+12V @ <18A
Input Voltage: 115 VAC / 230VAC
Input Frequency Range: 47Hz-63Hz
Input Current: 8A/5A
Output: +3.3V@28A, +5V@35A, -5V@0.5A, +12V@18A, -12V@1A, +5VSB@2A
MTBF: 80,000 hrs. @ 25ºC
Approvals: UL, TUV, CB, VDE, FCC CLASS B, DEMKO, NEMKO, SEMKO, FIMCO

Asus A7N8X non-Deluxe
BIOS 1004
FSB@133
VCore@1.75V

768MB DDR SD-RAM
512MB Corsair XMS PC3200C2
256MB Kingston PC2700 ValueRAM
RAM@133 (synced with FSB)

AMD Athlon XP 1600+
Overclocked at FSB@166 and VCore@1.85V for a while
No problems

Radeon 9500 Non-Pro
Not overclocked
Not softmodded

Seagate Barracuda IV 80GB IDE
Seagate Barracuda IV 40GB IDE
Toshiba DVD-ROM IDE

Case/Fans/Heatsink
A bunch of Panaflo L1As
SLK-800
CoolerMaster 111C (Great airflow)

Anything I forgot?
 
4.3V on the 5V rail is pretty low. It could be a bad PSU but it could also be something else in the system messing up and causing it to drop like that. Try disconnecting all drives except the one you need to boot the system. Also take out the 512mb stick of ram. If you can temporarily disconnect all fans except for the one in the PSU and on the CPU. If the case is open you won't build up heat fast enough for it to be a problem. If you want put a table fan next to it just in case. That should cut down on the power draw from the PSU substantially. If you can boot up fine with that stuff disconnected it could very well be the PSU or one of those devices causing problems. I'd go through and hook things up one at a time until you find something that just doesn't act right.
 
Originally posted by Anarchist4000
4.3V on the 5V rail is pretty low. It could be a bad PSU but it could also be something else in the system messing up and causing it to drop like that. Try disconnecting all drives except the one you need to boot the system. Also take out the 512mb stick of ram. If you can temporarily disconnect all fans except for the one in the PSU and on the CPU. If the case is open you won't build up heat fast enough for it to be a problem. If you want put a table fan next to it just in case. That should cut down on the power draw from the PSU substantially. If you can boot up fine with that stuff disconnected it could very well be the PSU or one of those devices causing problems. I'd go through and hook things up one at a time until you find something that just doesn't act right.

Tried that. No change. (In fact I have been running fanless for over a week... since that seems to help)
 
Did you try taking everything back to stock speeds and see if that fixes it?
 
Originally posted by Wixard
Did you try taking everything back to stock speeds and see if that fixes it?

Everything IS at stock speed. I stopped overclocking over 2 months ago. And it didn't fix it.
 
I use and live by the antec line of psu's, i also hear thermal take makes a good psu as well, if i can find the formula i will post it here for taking the voltage and watts for certian wires and coming out with the actual wattage for the psu
 
I don't want a Thermaltake or Antec... I have had bad experiences with both.

I am thinking Vantec. How does that sound?
 
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