Hello here is the ASUS homepage:
http://support.asus.com/Download.aspx?SLanguage=en&m=P5N73-AM&p=1&s=22Here is a list of beep codes:
http://www.computerhope.com/beep.htmYour pci-e graphic card is failing or has a defect.
The problem could also be the power supply, not giveing enough power.
When you add a pci-e graphic card on the mainboard, the onboard graphic should deactivate itselves.
Try to remove the pci-e graphic card, and use the onboard graphic.
If still no picture, change the power supply.
Its not possible to change settings in the bios blindfolded.
You can reset the bios by removeing the cmos battery.
But ofcouse it could also be the mainboard itselves failing.
This is rarely happening, so i hope its just the power supply.
Try also to look for visual defects on the mainboard, especially the condensators on the mainboard.
Good luck
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