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Motherboard issues not sure? System powers off for no reason but powers on? Need help

post #1 of 2
Thread Starter 
Hi everyone. Have a particular problem and I'm hoping those who love puzzle or are good at problem solving can help me with my situation because I have big mystery here.

I have a computer:

Motheboard GF7050V-M7 produced by biostar. Full specs on the board can be found here http://www.biostar.com.tw/app/en/mb/...t.php?S_ID=356

The memory in the system is: Corsair Value Select 1GB DDR2 667MHz CL5 DIMM (VS1GB667D2)
The memory was purchased from here: http://www.biostar.com.tw/app/en/mb/...t.php?S_ID=356

The power supply in the system is: Antec earthwatts EA380 380W Continuous Power ATX12V v2.0 80 PLUS Certified Active PFC Power Supply

Full specs on the power supply can be found here: http://www.newegg.com/Product/Produc...82E16817371005

What's happening is that when I press the power button on the computer the system boots up.

You can see the keyboard lights flash, the computer beeps and begins its post count. After the post the system looks for an operating system. The system is of course set to check the CD ROM drive first by default. Around this time the system power off for no reason. I tried to get into the bios. I press the delete key. I enter the bios and it loads. Then 2 to 3 seconds later as soon as I enter the bios the system turns off.

After the system powers off I turn it back on. Same deal happens again.

Now after 6 or 8 tries of powering on the system immediately after it powers off I will able to finally get past the post without the system shutting down and boot the operating system and Windows XP loads. I arrive at the desktop and everything is stable.

I can run any programs with no issues.

Now if I go start -> turn off computer and select restart computer the system will begin to shut down and turn off. After the system turns off it reboots. This time the system gets past post. No powering off and loads the full OS. I did this multiple times.

Ok now the next thing I decided to try was to shut the system down completely. I went to the Start Menu -> Turn Computer Off and seleted Shut Down System. Windows XP begins to shut down and the finally the system is fully turned off. I wait about 5 seconds to 10 seconds. Once I hear all the fans stopped spinning I then press the power button to turn the system back on. The computer keyboard lights flash. The system goes through post and system loads normally and I am at the Windows desktop. System is stable can run any program. No issues.

Now I decided to see what would happen if I turn off the computer completely and wait 10 minutes to 30 minutes and then turn it on. I do this and noticed as before that the system gets past the post and as soon as it tries to load an OS it will turn itself off. I even tried to see what happens when I enter the bios as well at this point. I get into the bios and bang system powers off and I am back to square one.

So it seems the system works if I power it back immediately multiple times after it shuts off. Kinda like getting car engine to turn in Winter.

Now the system I am having problems with was given to me by a friend. He had purchased 2 systems about 3 years ago. Both computers have the exact parts/components (No difference). One system was for his wife and the other for himself. He gave me his system as the RAM went bad (would not pass memtest86). Later on the power went bad later on and since he want to spend the money on a new stick of ram or power supply he gave the system to me.

So now the only difference is the power supply I have in mine and the memory are different brands.

At first I thought it was the power supply. So I called my friend up and we did a few tests.


1) First we swapped power supply's first. My power supply worked perfectly fine in his system with no issues. His power supply however did the exact same thing with my system as described above. So I have ruled out its not the power supply here.

2) Next I have tested the memory by running MEMTEST86. The memory in my system passed with flying colors with no errors. So its not the memory.

3) I checked the CPU temperature in the BIOS in the system he gave me. No problems found. Just to be sure I even undid the heatsink and reapplied Artic MX-4 thermal Paste just to be certain its not the CPU. The CPU is chilling at a nice 28 to 30 C and the fan is spinning at approx 2020 RPM when I look at in the BIOS.

4) I have even went into the BIOS and loaded the default safety settings. Same issue occurs as above.

5) The harddrive has a fresh clean install of Windows XP with service pack 3. As I'm writing this post I am using this very system which is stable. I even tried swapping hard drives with my friend's system. Both harddrives are the exact same make/model and my HD has no issues on his system.

So at this point not sure what the problem is or what further tests I can do. Hoping for some idea's here.

The last thing I haven't done is to flash the bios but I rather not do that unless absolutely necessary.
post #2 of 2
First off, this is the AMD board forum and that's an Intel board.

Unless the system is 100% healthy, I wouldn't flash the BIOS. Any type of interruption during flashing = dead board.
Only have the CPU, a stick of RAM, 1 x HDD, and 1 x ODD installed on the board and nothing else. Use new/known good cables.
Inspect the board for bad capacitor, loose heatsink (not hot enough when running), or burnt MOSFET.
Load BIOS default and set memory timings and voltage manually. Run the latest Memtest86+ via USB/CD.
Run Prime95 small/blend or any other stress tester to check if the CPU is okay.
If you've been running with onboard video, use a descrete card to isolate problem with the IGP.
Heckling Hestia
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X2 555 Black Edition @ X4 B55 Biostar TA790GXE 6.1 Radeon HD 3300 (IGP) G.Skill F2-6400CL4D-4GBPI-B 
Hard DriveOptical DriveOSMonitor
Western Digital WD6400AAKS Sony VRU-200S @ NEC Optiarc AD-7200S x64 Dell UltraSharp 2007WFP Rev.A03 (LG.Philips S-IPS) 
PowerCaseMouse
Corsair CMPSU-450VX Thermaltake LANBox VF1000SWA Razer Deathadder C&C Kane's Wrath Edition 
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Reply
Heckling Hestia
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X2 555 Black Edition @ X4 B55 Biostar TA790GXE 6.1 Radeon HD 3300 (IGP) G.Skill F2-6400CL4D-4GBPI-B 
Hard DriveOptical DriveOSMonitor
Western Digital WD6400AAKS Sony VRU-200S @ NEC Optiarc AD-7200S x64 Dell UltraSharp 2007WFP Rev.A03 (LG.Philips S-IPS) 
PowerCaseMouse
Corsair CMPSU-450VX Thermaltake LANBox VF1000SWA Razer Deathadder C&C Kane's Wrath Edition 
  hide details  
Reply
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