You may need to provide more deatils about the hardware installed on the system such as the model number of the processor installed, part number and manufacturer of the memory installed and the wattage of the power supply installed, also deatils on the other hardware installed.
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?)