Computer freezes/shuts down, loud continuous beep when rebooting

[Coolbest]

Hello, my pc (specs below) often freezes, after which turning it off is the only option, or it shuts down without warning, after which it will try to reboot. Upon rebooting there is often a loud continuous beep and the pc won't start up. This problem occurs almost exclusively within 15 minutes of booting up, and once it happens it will occur several times. Sometimes it works for hours straight, and if I keep it in sleep mode instead of turning it off it can work for days straight.

I've tried resetting the computers to the manufacturers settings three times, after which it worked fine for a month or two. But then the problem starts again. I hope someone can help me here.

The pc is an acer x3990, running windows 7 home premium 64 bit,
intel core i5 2320
NVIDIA GeForce GT520 up to 4095MB
8GB DDR3

 

[Mellon Head]

Hello, my pc (specs below) often freezes, after which turning it off is the only option, or it shuts down without warning, after which it will try to reboot. Upon rebooting there is often a loud continuous beep and the pc won't start up. This problem occurs almost exclusively within 15 minutes of booting up, and once it happens it will occur several times. Sometimes it works for hours straight, and if I keep it in sleep mode instead of turning it off it can work for days straight.

I've tried resetting the computers to the manufacturers settings three times, after which it worked fine for a month or two. But then the problem starts again. I hope someone can help me here.

The pc is an acer x3990, running windows 7 home premium 64 bit,
intel core i5 2320
NVIDIA GeForce GT520 up to 4095MB
8GB DDR3

According to this:

Beep Codes - Acer Aspire X3990 Service Manual [Page 79]

it's a memory error. Try running Memtest86+ on the laptop overnight (if you can get it to run that long) and see if it finds any errors.

Memtest86+ - Advanced Memory Diagnostic Tool