What can be wrong with a motherboard that only works when I swap the CPU, turn the laptop on, then off, and then put the original CPU back?
Posted on 2011-03-23
Hello again experts. I need help with a Gateway M-7301e laptop and a very strange problem. It was working fine until one day pushed the ON button and didn´t gave any video signal, just all leds blinking like crazy. In fact I had to take out the battery in order to turn it off.
I suspected and tested some things to troubleshoot the problem, like the memory modules, the battery, the AC/DC adapter, with no success. So I looked around for an used CPU that could fit the MoBo and surprinsingly I found one Intel Core 2 Duo T5270 that made the laptop to work again (the original CPU is an Intel Dual Core Pentium T3200). So I thought the problem was the CPU, and to confirm it I swapped back the CPUs, but for my surprise again, the laptop worked ok. Turned the laptop off and on many times to see if the problem appeared again but it didn´t. The laptop worked just fine. So I decided to do some more testing and ran MemTest for about an hour, and then Prime95 for another two hours. None of them showed something bad. So I decided to turn the laptop off and let it stand for the night.
At the next day I tried to turn the laptop on and nothing but the blinking leds happened again. So I took out the original CPU and tried to turn the laptop on with no CPU on it, just for the heck of it. I put back the original CPU and still nothing, just the blinking leds. So I swapped again the CPUs and boom, it worked again (with the Core 2 Duo CPU). Once again put back the original CPU (the Pentium Dual Core) and the laptop kept working. Well, until it cooled down again.
Do you have any ideas of what can be wrong and how to fix it?
Thank you very much in advance.