The computer starts, howl, the screen remains black

Description of the problem
The computer is powered and flashes but monitor remains black howl (or no signal)

Features PC

Motherboard: Asus
Processor: Intel Dual Core
2x2GB DDR 2 memory
Power supply: 450 W LPK 19.30


Possible and probable defects
When a computer is the processor works howl and, in principle and the motherboard.
The problem usually is from memory (damaged or moved in the slot) or video card (damage or shaken)

Identifying the problem
Remove memoirs and video card and reinsert them into the appropriate slots.
If the problem is resolved in the slot means it miscasera. This can happen because of shocks, bumps or large temperature differences.
If not fixed then you should try with another memory and another video card, replacing them all.

Defect
In this case it was faulty memory module (ARS).

Fix
The problem was remedied by replacing the memory module 2GB takeMS DDR2.