Hey everyone. I just built this computer a few days ago and it fails to POST not all the time, but most of the time. Like 1 in 4 times it will boot. (I don't have a case speaker, but nothing shows up on the monitor at all.)
-The LEDs on the fan and motherboard DO light up
-When it fails, the Graphics card has a red light at the end of it. (It normally blinks, then goes off, but when the system fails, the light stays on)
-However, I don't think it is the graphics card. When I take it out and use the integrated video, it still fails just as often.
-Memory also probably isn't the problem. I tested the two DIMMs by themselves in a core i7 system (with Asus P6T Deluxe) and they passed memtest86+.
-I've tried using each stick alone in each of the two orange slots, but that doesn't make it any more reliable. It's hard to test this though because it seems random when it will boot and when it won't.
-With a LOT of restarting (to get it to boot enough times) I managed to install windows and flash the bios to the latest. Once it POSTs it is stable enough to do all this.
-I've checked and rechecked that everything is firmly plugged in. I have the motherboard standoffs in and everything. I don't think it's an absent-minded goof.
could be the motherboard, check that all the cables are plugged correctly. also if you have another mobo laying around, try that one and see if the mobo is the problem. also check the ram timing in the BIOS
DRAM frequency has a list of options: [Auto, 800MHz, 1067, 1333, 1600]. I assume it's already doubled.
In CPU-Z with everything set to [auto] (since it won't boot at the correct settings) the memory seems to be right. It says DRAM Freq. ~668 , 8-8-8-21. (CL,tRCD,tRP,tRAS)
Also tRAS is 21, tRC is 33 and CR is 1T. Don't know if that's important.
That's odd; why will it run the correct timings automatically but not when I set them?
I suspect either a compatibility issue between the board and PSU, or a faulty PSU or board.
It sounds as if your board is trying to start before the power supplied is stable. PSUs take a few micro-seconds to warm up, at which point they send a power ready signal to the motherboard saying it's OK to start.
Maybe the board is not waiting.
Maybe the PSU is sending the signal too early.
Maybe either part is just bad.
When you "save and boot" from the BIOS, typically it involves a PSU shutdown and restart, as I recall.
When you restart from the start menu, the PSU stays running.
If the 650TX was shipped to you, I would say it's a 50-50 thing. Heavy PSUs get jarred easily in shipping. But then, the MB is more likely to be bad otherwise... hence the 50-50 thing.
Check to make sure that the capacitors around the cpu socket are not bubbled up on the top. If the tops of them protrude outward, you have your culprit. You need to replace those caps with higher value caps or replace the motherboard. At any rate, it is certainly a voltage regulation issue.
If you don't notice the caps bubbled up, switch psu's. I have seen hard drives bind up and the motor trying to move draws enough current on that rail that it's almost like a dead short and the computer freezes.
If that doesn't work unplug ALL non-vital components and try to boot with just a barebones system. You don't even need ANY drives. You're just testing for post, not for OS. If it works consistently this way, plug the extra devices in ONE BY ONE until you figure out what the culprit is.
i will recommend you to talk with a few friends and see if the have a board that you can test your set up. so you can determine if the problem is the mobo. i dont think is a memory problem because you already try that in another computer and it worked perfectly. so the problem must lay around the PSU and the mobo.