hello,
I am having this wierd problem after installing a new GA-P35T-DQ6 motherboard. Before installing this motherboard, I was using a 478 motherboard that was working perfectly fine. I wanted to do a motherboard upgrade in the same case, so I tried a 775 motherboard with a pentium D processor and a 500W PSU. When I power-on the system, it whines for a second or so and then power off and tries to restart itself and goes through the same circle. I thought it was a motherboard failure so I got this gigabyte board to try and it gave me the same results, but the weird thing is that when I changed the PSU from 500W to 550W, it whines for about 30 seconds and stop and then tries to restart itself and then goes through the same process again and again.
Can someone tell me if I need over 1000W PSU to power up a GA-P35T-DQ6 motherboard or there is something left undone??????????
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If the problem exists independently with two PSUs, and two separate mobos, and if the whining is coming from the PSU, then it sounds like something is overloading the PSU. If the mobo is not damaged/failed, then a 500+W PSU should certainly be able to power it.
Could be a short in case cables, on a power connector, between the mobo and the case, between installed devices and the case, etc. Although usually difficult to do, it could also be a reverse-installed connector. Sometimes the polarization keys on connectors don't adequately prevent improper connection.
Try disconnecting EVERYTHING except the mobo and CPU power connectors. Remove the memory, all adapter cards, and external connections except power.
Then, power up. Does the PSU still whine? If it does, one of the more common suspects is a short betwen the mobo and the case where there shouldn't be one.
If it did not whine, then you can start adding devices and additional connections one-at-a-time until either the symptom re-appears, or you don't see it again.
Important System Handling Advice
You should use proper ESD (Electro-Static Discharge) handling and parts storage procedures at all times. ESD damage can cause permanent damage to computer parts. ESD damage may be immediate or may not be noticed until months after the actual ESD event. ESD damage can produce entirely unpredictable failures and may even mimic other types of software and hardware failures.
Remember that the PSU's AC mains power must be turned off or the wall-plug disconnected before you add or remove any device in the computer. Wait a few minutes after removing power before connecting or disconnecting anything. After waiting, some people also recommend pushing the front panel power button to bleed-off any residual energy in the PSU. Safety Note: system fans may spin when you do this. AC mains power must be removed. Just turning the system off by using the front power switch is NOT enough and can result in permanent damage to the hardware.
Both ESD and/or not disconnecting mains power while handling components in the system also have the potential to corrupt CMOS, which could also corrupt system, CPU, and RAM voltage and timings settings.
I have all I could to get this working, but to no avail. I am suspecting the pentium d cpu because when I removes the cpu but all cables intact,the fans works very good, but when I insert the cpu the fans do not work properly. Does that mean that the pentium d 805 is not compatible with this board????
Since the GA-P35T-DQ6 does support the appropriate Pentium 805d 775 CPU, that in itself isn't necessarily the problem.
It could also be that the CPU is bad or installed incorrectly, or that somehow the voltage/timing settings for the CPU were set wrong and then damaged the CPU (or causes it to malfunction) which then overloads the PSU, or that there is a problem with the mobo connector (or circuitboard under the connector) that comes into play only when a CPU is installed, etc.
edit-add the mobo CPU connector/board possibility and preface the statement about what else could be worng.
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