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Old October 17, 2009, 09:07 AM
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Default Randomly posts, semi new build with same problems

To try to make this somewhat short, earlier this week I turned my pc on, and everything lit up but nothing displayed on screen, and the usb mouse/keyboard wouldn't light up. After trying a few different things, (PSU, booting with different/no ram, testing parts in another computer, etc.) I was talking to a guy at a shop, and he asked me the temp on the MB, I told him the CPU was usually around 25C and the motherboard around 70C.. His jaw dropped, told me I basically cooked my northbridge.

Noobs will be noobs.

I decided this was a good time to upgrade my system, grabbed a new motherboard, CPU, RAM and a much better CPU waterblock.

The system's spec is:

MSI NF750-G55 AM3 NVIDIA

AMD Athlon II X4 630 Propus 2.8GHz

2 Seagate Barracuda 500G hard drives

2 8800 GTX OC2 video cards, sli

Patriot Viper II Sector 5 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666)

Antec TruePower Quattro 850 W Power Supply

Thermaltake LCS Kandalf case (BigWater watercooling system)

Thermaltake Aqua Bay M5 pump/ LCD display

2 DVD/CD Litescribe burner/readers (one is Sony the other is LG)

--
Went home, installed everything, I go to push the power button.. and.. nothing. Checking wires, trying to get it to boot with different things plugged in, etc. and the computer is posting randomly. Sometimes it will boot, other times it won't. It doesn't matter if it has one video card, two video cards, the onboard video, ram in differnet slots, etc. The closest I got was when I unplugged the dvd/cd drives and tried.. it booted 6 times in a row.

Then stopped, and went back to the random pattern. With, or without the drives being plugged in (or only one of them plugged in.)

All the parts being tested together and in seperate computers, or on their own prove that they all work. Everything is seated correctly, everything is wired, everything is compatable.

I'm at a complete loss to what this could be. It's basically a new build, with the same problems. The only common denominators are the hard drives, dvd/cd drives, case, PSU. And yes, it was/is on a power bar with a surge protector, and it's never been touched without an electric static band, or any tools that weren't made for PC repair.

It isn't possible to pull the motherboard out and try building it outside the case, due to the CPU waterblock mounting.

I'm totally stumped.
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Old October 17, 2009, 11:53 AM
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How did you get the motherboard temperature to 70C in the first place? My Asus M3A78-T with its little aluminum passive cooler can only break 50C if I overclock and run F@H or Crysis. Are you sure you are not repeating that problem again?
Upgrading the waterblock on your CPU will do nothing to the motherboard temperature; what you need is increased cooling on the northbridge and southbridge, which are normally the two biggest (in surface area) chips on your motherboard, usually covered by heat sinks of their own. Did you modify any heat sinks of the motherboard? Unless you REALLY up the volts, you should not have to...
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Old October 17, 2009, 12:02 PM
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It's a new motherboard.

The old motherboard, what happened was (asus m2n something) the old waterblock was blocking the northbridge slightly and not letting it get enough airflow - whenever I turned it off, the coolant in the tubes would just sit there and slowly cook the bridge. (first build mistakes, but this is still just an educated guess as to what happened with the old board.. was running for two years fine.)

The motherboard now, the new one is running around 30C when it gets into bios.. It's just laid out differently, and the waterblock doesn't touch or interfer with the bridge.

I don't overclock, didn't touch the heatsinks on the new board.
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Old October 19, 2009, 10:47 PM
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Hrmmm, not being able to take the motherboard/CPU/case apart to test separately makes this more difficult. Have you been testing the other parts like the PSU in another machine? Could you then try swapping in the DVD/CD drives as well? Then the RAM? Then the hard drives? Or whatever order makes most sense until something stops working. I would suggest it could be the case itself considering the motherboard and CPU is new. I'm curious if there is a problem with the power button/cable that connects with the motherboard to turn it on.
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