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PC reboots after sleep

TomvanWijnen
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So, today I've put in a less terrible GPU in my Dell Optiplex 755, and reinstalled Windows 7 64 bit. Before this, the problem never happened. But I immediately turned sleep off so that makes sense :P

 

The problem is, when the computer idles for some time, it goes into sleep (makes sense). But when I then wake it, it works for about 45 seconds, and then reboots! What is going on? Could someone help me?

 

Specs:

Dell Optiplex 755

Intel Core 2quad q6600

NVIDIA GT 220

8 GB RAM

80 GB HDD

Windows 7 64 bit

 

Thanks everyone! :)

PC SPECS: CPU: Intel Core i7 3770k @4.4GHz - Mobo: Asrock Extreme 4 (Z77) - GPU: MSI GeForce GTX 680 Twin Frozr 2GB - RAM: Crucial Ballistix 2x4GB (8GB) 1600MHz CL8 + 1x8GB - Storage: SSD: Sandisk Extreme II 120GB. HDD: Seagate Barracuda 1TB - PSU: be quiet! Pure Power L8 630W semi modular  - Case: Corsair Obsidian 450D  - OS: Windows 7

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