» Sat Jul 07, 2012 9:05 am
Keep in mind that most of the geniuses at Best Buy couldn't tell their ass from a SATA cable, so take anything they tell you with a very large grain of salt. Also keep in mind that motherboard problems can be very difficult to diagnose, and are often only diagnosed by the process of eliminated all other components as the possible source of a problem. Since it doesn't sound like you're getting any kind of error codes when trying to boot (either beep codes or an error code on a motherboard LED display) there's quite a few other things you should be checking before you consider the motherboard the source of the problem. From the sound of it you've already eliminated a bad cable as a possible problem; the next easy thing to check is if for some reason your monitor has crapped out (find another monitor and try hooking that up). The next easy thing to try is to move your graphics card to a different slot just to rule out the possibility that the slot it's in has stopped working. And as DEFRON suggested try hooking up your monitor to the integrated graphics port if your motherboard has it (this will tell you if the problem is with your GPU). If all those things fail to give you a graphics signal then the troubleshooting becomes a bit more tricky. One thing you can try is booting up your computer, then listening closely to see if you can hear the hard drive spinning up, or any other sounds that are customary when starting up your computer. This could give you an idea of whether it's a simple graphics issue you're dealing with, or if you computer is failing to POST. If it's the latter then the possible problematic components are as follows: RAM, motherboard, processor, PSU. RAM is the easiest of these to check, at least if you have multiple sticks. Pull all but one of the sticks, then try starting up the computer with that stick in at least two of the RAM slots (to ensure it isn't just a problem with the specific slot). Repeat this for each of your other RAM sticks (it's highly unlikely that all of them would have failed simultaneously). If you still haven't found the problem then distinguishing between a motherboard, processor, or PSU problem can be very difficult if you don't have components to swap out. You can try visually inspecting the components for signs of damage, such as burst or bulging capacitors, or singe marks; also smell for any burnt electronics smells. If you still don't have any likely candidates then you're going to have to start swapping out components based on guesswork- see if you can track down a replacement PSU and processor (hit up your friends if necessary), and if swapping out these components don't do anything only then can you say with a fair amount of confidence that you're probably dealing with a motherboard problem and go about replacing it.