CPU: Core2 Duo E7400
Cooler: Thermaltake Polo 735
Paste: Spectra Cool (had fresh paste put on yesterday)
Memory: 2gb Hynix 800Mhz DDR2 x 2 (replaced with multiple ram sticks produces same problem)
Video Card: Gainward 8600GT 1gb (removed and used internal graphics produces same problem)
Hard Drives: 500gb Samsung SATA x 2 (removed, tried single boot drives all sizes produces same problem)
PSU: 550W (tried 650w, 750w and 450w no difference)
Cabling: Standard SATA cabling, tried Thermaltake SATA didnt help
DVD Drives: 1x Samsung DVD-R and 1x LG DVD-R Lightscribe
Other Attached Devices: None except for a 2 port USB adaptor plug removing this didnt help either
OS: Windows XP Pro.
I run the system with 2 seperate power supplies:
The main one is for the mobo, CPU fan and HDD, DVD Drive
The second one is for all the other fans and Metering devices which show temp, time etc.
I use 2 so as not to overload the main PSU
After shut-down, turning the system back on it cycles in 10 second on/off
Holding the power button the boards turns off then I remove the jumper pin completely and turn the system on
The screen stays blank and I wait about 20 seconds then turn it off by holding the power button
Once off I put the jumper back to default and press the power button the mobo switches on and all is fine
The above is what I have to do each time to get the mobo to turn on.
Once the system is on its runs fine, does not crash, freeze or such, this is very weird I know but that
is what happens.
I also tried removing the battery (it checks fine) to reset the BIOS this doesnt help
Try to test the system out of the chassis, placed on a non-conductive surface like a newspaper, a magazine or something similar to make sure that this is not a grounding issue, update the system BIOS and if possible test with tested memory. If the issue continues a motherboard replacement may be required
For information on tested memory you may refer to this site:
I have the same exact problem and have tried to resolve it with the all of the same methods including bench testing the MB on a wooden bench. In addition I have take all the components that I have swapped out, memory, processor, ps, etc., and built them into to systems which are presently up and running with no problems, errors or issues.
I was experiencing this same issue and DOA'd 2 boards before I realized it was a case of this particular mobo being VERY touchy about certain rails' voltage levels coming from the PSU.
I managed to work around it by loading the PSU (with hard drives). With 4 drives in the box it boots fine every time and hasn't skipped a beat. As soon as I reduce the load to the motherboard itself, it fails.
I suspect cheap parts in the power circuits (huge liquid caps? who uses those any more?)