I have a antec S1030B connected to a MSI K7T Pro2A. It doesn't seem to want to POST when I cold boot. This is the only time it doesn't POST, and I can immediately hit the reset button and it will come up. What's up?
Happens quite often with via chipsets. A bios flashed helped me once. In another system, one of the fans was drawing too much power. Try running with no hardware monitoring disabled.
Most likely the power supply's Power_Good signal is being generated too early or too late for the motherboard. This doesn't necessarily mean that the supply is bad or out of spec, only that it's incompatible with the board.
Tonec, my VIA-based FIC board required a P_G signal at least 5 times faster than what my supply generated.
I have the same setup and yes sometimes it does not cold boot on the first try. It runs fine otherwise but it may take one or two hits of the power button to get it booting. This was very disappointing when I first built the system because it wouldnt boot at first, all the leds were red. I didnt know at the time the reset button was recessed and you have to push it in with something skinny. I kept trying with my finger and no reset. So between not being able to boot and not being able to use the reset switch I thought I had a bad board or something. This is not a major problem but it is a little disconcerting when you buy two highly regarded components (antec S1030B case and MSI K7T Pro2A) and they dont seem to work perfectly with each other. Maybe its just the Black case that has this problem ?
When booting I have to cold boot twice in order to boot.
and thats a cold boot from the switch on the back of the PS.
If I press the power button on the front of the case I have to still switch it off in the back 2 times before I can get it to boot.
The reset button however on the front of the case usually works not always though. also the cntrl alt delete hardly ever lets me boot back up.
If I set windows to reboot it is usually successful in doing that however if I tell It to shut down. It gets stuck at the windows is shutting down screen. shut down to dos always shuts down to dos very quickly, But I still have to hit the ps switch in back to shut down.
this prob is more of an annoyance more than anything.
Ive tried it with another ps that is amd aproved and still the same thing im not sure why this is happening im about to send the board back or the case back not sure which one.
to send back.
The Power_Good Signal
The Power_Good signal is a +5v signal (+3.0 through +6.0 is generally considered acceptable) generated in the power supply when it has passed its internal self tests and the outputs have stabilized. This normally takes anywhere from 0.1 to 0.5 seconds after you turn on the power supply switch. This signal is sent to the motherboard, where it is received by the processor timer chip, which controls the reset line to the processor.
In the absence of Power_Good, the timer chip continuously resets the processor, which prevents the system from running under bad or unstable power conditions. When the timer chip sees Power_Good, it stops resetting the processor and the processor begins executing whatever code is at address FFFF:0000 (usually the ROM BIOS).
If the power supply cannot maintain proper outputs (such as when a brownout occurs), the Power_Good signal is withdrawn, and the processor is automatically reset. When proper output is restored, the Power_Good signal is regenerated and the system again begins operation (as if you just powered on). By withdrawing Power_Good, the system never "sees" the bad power because it is "stopped" quickly (reset) rather than allowed to operate on unstable or improper power levels, which can cause parity errors and other problems.
In most systems, the Power_Good connection is made via connector P8-1 (P8 Pin 1) from the power supply to the motherboard.
A well-designed power supply delays the arrival of the Power_Good signal until all voltages stabilize after you turn the system on. Badly designed power supplies, which are found in many low-cost compatibles, often do not delay the Power_Good signal properly and enable the processor to start too soon. The normal Power_Good delay is from 0.1 to 0.5 seconds. Improper Power_Good timing also causes CMOS memory corruption in some systems. If you find that a system does not boot up properly the first time you turn on the switch but subsequently boots up if you press the reset or Ctrl+Alt+Delete warm boot command, you likely have a problem with Power_Good. This happens because the Power_Good signal is tied to the timer chip that generates the reset signal to the processor. What you must do in these cases is find a new high-quality power supply and see whether it solves the problem.
Many cheaper power supplies do not have proper Power_Good circuitry and often just tie any +5v line to that signal. Some motherboards are more sensitive to an improperly designed or improperly functioning Power_Good signal than others. Intermittent startup problems are often caused by improper Power_Good signal timing. A common example occurs when somebody replaces a motherboard in a system and then finds that the system intermittently fails to start properly when the power is turned on. This ends up being very difficult to diagnose, especially for the inexperienced technician, because the problem appears to be caused by the new motherboard. Although it seems that the new motherboard might be defective, it usually turns out to be that the original power supply is poorly designed and either cannot produce stable enough power to properly operate the new board, or more likely has an improperly wired or timed Power_Good signal. In these situations, replacing the supply with a high-quality unit is the proper solution.
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