Help - New computer with strange problem

Hello guys, two months ago i bought the following computer:

ASUS P5E3 Premium Wifi-AP @n Edition
Intel Core 2 Quad (Q9450) @ 2.66GHz
2x 1GB DDR3 OCZ3P1600EB2GK
2x 500GB WD5000AAKS (Raid 0)
EVGA 9800GTX 512M DDR3
CPU Cooler (OCZ)
PSU 700W OCZ700GXSSLI
LG - L226WTQ-PF 22” Wide


I assembly it together and power it up. Install Windows XP x64, all hardware drivers and update BIOS.

On the following weeks the computer has been crashing randomly, it simple hangs. If I have any music playing from a movie or computer game, the sound hangs on a loop or it makes a strange noise like a radio without reception.

Another problem is the monitor has shown some display errors when the mouse moves across the screen. (small red dots close to mouse pointer when moving).

For some time i blame the graphic card, as so i got my old one a 6600GT and replace the 9800GTX.

But the problem persists, as so im here asked for some help. You guys are the experts and the best. Hope some one will come with some brilliant idea what can be wrong with me system.

Thx a lot,
Narog

Hey Proximon thx for replying to my post.

I just run Memtest 86+ for about 30mins and all test run ok without any errors.

Going to try to remove 1 memmory and see what happen.

thx

Did you set the voltage for the memory?

You need to run memtest86+ at least for 3 passes, better overnight.

If you have another PSU available, try that.

Problem solved.

Everything is ok with the computer.

Some how the monitor generates this noise when moving the mouse. Its a cable problem or monitor defect.

Thx for the help guys.