My PC keeps shutting down for no reason

May 4, 2014 at 19:12:08
Specs: Windows 7, Intel Core2 Duo E7400 2.80GHz
For a couple of days now, my PC keeps shutting down for no reason. It would shut down and restart again. Sometimes when I try to press the "power button" it won't start the LED lights around the button would light up but it won't start (but it would start after a couple of tries). I overclock my PC but I think it is not due to overheating, because my PC is well ventilated, and all the fans are working. When I checked it using the SpeedFan, it showed that the fans aren't moving but when I opened the case the fans were working.

At first, I thought my system was infected by a virus but then I installed a fresh copy of Windows and it still keeps shutting down.

Is this a power supply problem?
Help, I'm not really a tech savvy so I don't know what the problem is.

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May 4, 2014 at 20:44:28
How about listing the specs? Make/model of the board, CPU, RAM, PSU, etc. And how much did you overclock? Did you try returning the CPU to its default clock settings?

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May 4, 2014 at 20:50:11
I downloaded an app, to tell my specs but it did not include the PSU.

OS: Windows 7 Ultimate 32-bit
CPU: Intel Core 2 Duo E7400 @ 2.80 GHz
RAM: 2.0 GB Kingston Single-Channel DDR2 @ 400 MHz
Motherboard: Gigabyte G41M-ES2L
Graphics Card: Intel G41 Express Chipset
PSU: I dont know. But its brand name is ETON, I guess.

message edited by Michaelensis

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May 5, 2014 at 13:44:15
"I downloaded an app, to tell my specs but it did not include the PSU"

All you need to do is open the case & get the info off the PSU label. ETON is not a brand I'm familiar with, but we need to know the wattage & amperage specs. Also, why are you only running a single stick of RAM? You're taking a performance hit by running single channel mode. And you should consider adding a graphics card so that you can get off the weak Intel onboard graphics.

As for overclocking - the default clock speed for the E7400 is 2.8GHz with clock settings at 10.5 x 266MHz frequency (1066MHz FSB). For best performance with a Core 2 Duo rig, the RAM frequency should match the CPU frequency. SO, to overclock "properly" you should keep the RAM at 400MHz, raise the CPU frequency to 400MHz, & lower the CPU multiplier to 7.0. That will keep the CPU at 2.8GHz but the FSB will jump up to 1600MHz rather than 1066MHz & the RAM freq will be running in sync with the CPU freq. That's known as maintaining a 1:1 ratio. Once you get the ratio straightened out, all you'd have to do is try increasing the CPU multiplier. It should easily run at 3.2GHz (8 x 400MHz) & probably wouldn't even require a voltage increase.

There are numerous BIOS settings that would need to be changed to pull it off. If you're interested in giving it a try, let me know & I'll post a list of settings.

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May 5, 2014 at 14:37:33
Riider: I am pretty sure that the G41 series does not support 1600FSB so he will be stuck with 1333FSB (333x9; 333x9.5; 333x10) with RAM underclocked to DDR2-667MHz

OP: Please install HWMonitor and post the exact temps (Deg. C) for CPU and all components (at idle and after 15minutes of normal use) to be sure that it is not a heating issue. Please post the listed specs from the power supply from the label (All numbers for all voltages). Please post the exact OC settings from BIOS. Do NOT use software OC if you want any real control over your system.
Run Memtest from a bootable CD to prove that your memory is not to blame. You absolutely should be running 2 identical sticks of RAM (sold as matched sets) to make full use of dual channel mode for memory.
Windows 7 32bit can run on 2GB of memory but runs much better on 3GB to 4GB (3.2+ usable) and Windows 7 64bit will run decent on 3GB to 4GB RAM but runs much better on 4GB minimum with 8GB a significant improvement for multitasking.

You have to be a little bit crazy to keep you from going insane.

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