Its a new pc & is not at all starting, right from the motherboard fan. The light in the motherboard alone glows when the power is on. Changed the SMPS and tried but the problem still persists.

Is it a new PC that you have built? If not, you should contact the manufacturer as you might invalidate the warranty if you open the system case to try to fix it yourself.

It is a new PC built by myself

Please list your major components.

Are you 110% certain you only used standoffs where there is a corresponding motherboard mounting hole?

Did you use TIM (thermal interface material) on the CPU?

Are you sure you connected all the necessary PSU connections?

I don't understand this "you only used standoffs"
& i haven't used any TIM.
& i'm sure that have done all the necessary connections.

Originally Posted by varmanarul

I don't understand this "you only used standoffs"

The "Standoffs" that Digerati is referring to are those little metal nuts or "spacers" that you insert into the motherboard mounting plate in the PC case. Once the standoffs are inserted, you place the motherboard onto them and then fix the motherboard into the PC case by fitting the screws through the motherboard into the standoffs. Digerati was asking you to confirm that you didn't accidentally put standoffs where there were no holes - this could create a short-circuit by allowing electrical current to flow between bits of metal / circuit board that are not supposed to be connected.

The brass standoff screws into the case, the motherboard sits on the standoffs, and the motherboard is secured to the standoffs with the screws.



It is important to note that cases are designed to support 1000s of motherboards. The ATX standard only states that if the motherboard has a mounting hole, it must be in one of the several specified spots. It does not require holes exist in every defined spot. Therefore, a common mistake with inexperienced and unprepared builders is they insert standoffs in each available location. But as DJNafey stated, if the motherboard does not have a corresponding hole, critical circuitry on the motherboard may be shorted to chassis ground. Then, sadly, when powered on, it often results in destroyed motherboards, and often CPUs as well. And damage from such misuse is not covered under warranty.

You MUST use some form of TIM between the mating surfaces of the CPU die and the CPU's heat sink. Not doing so will result in poor heat transfer between the CPU and heatsink. Note that many heat sinks come with a thermal pad already attached to the heatsink. Although not the best, they are adequate. However, once used, if the heatsink is removed, the mating surfaces must be thoroughly cleaned and a new layer of TIM must be applied. At that point, I recommend using a good silver or ceramic based paste.