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Dell XPS M1530 running Vista SP1. Recent problem. When machine automatically enters standy, it will not resume. even after a hard reset. A brief power light and then nothing but fan noise. Black screen, no power light.

Actually when it goes to auto-standby ,it doesn't go all the way. All leds are off and screen is black but fan is going. I do a hard power down, remove the battery and wait a few hours before replacing. Machine will then reboot.

No problem when I manually sleep the machine. No problem with hibernate. Hybrid sleep turned off.

Problem only on Automatic timed mode sleep (which I have turned off for now).

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Try disabling the Advanced Configuration and Power Interface within the Device Manager. The ACPI can cause a lot of unexpected issues when the batteries starting to die. Also try what TuxRug said it'll help narrow down the problem.

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I know this screen shot is from a Windows XP machine, but its the same on Vista. –  MHrappstead Nov 8 '10 at 2:43
    
Here's what I got with the Pwercfg queries. Last one would not work. –  Edp Nov 8 '10 at 13:12
    
Looks like I have to post separate results due to comment length restrictions. C:\Windows\system32>powercfg -l Existing Power Schemes (* Active) ----------------------------------- Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e (Balanced) Power Scheme GUID: 49ef8fc0-bb7f-488e-b6a0-f1fc77ec649b (Dell Recommended) * Power Scheme GUID: 8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c (High performance) Power Scheme GUID: a1841308-3541-4fab-bc81-f71556f20b4a (Power saver) –  Edp Nov 8 '10 at 13:13
    
OK - how do I post these results in a readable manner? thanks! –  Edp Nov 8 '10 at 13:16
    
Thanks for the replies - I've reposted a different hopefully more coherent statement of the problem. –  Edp Nov 8 '10 at 23:44
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