Won't wake after Sleep/Hibernate/Standby

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My System:

* AMD Athlon 64 X2 6000+ Windsor 3.0GHz Socket AM2 125W Dual-Core Processor Model ADX6000CZBOX
* ASUS M2N-SLI Deluxe AM2 NVIDIA nForce 570 SLI MCP ATX AMD Motherboard
* PSU: Antec Smartpower 500W
* 4 sticks: CORSAIR XMS2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model TWIN2X2048-6400C4
* Western Digital Caviar SE16 WD2500KS 250GB 7200 RPM SATA 3.0Gb/s 3.5" Hard Drive
* Windows 7 x64 RTM

If I go into sleep or hibernate mode, the only way to power back on is to unplug/plug in the unit (I just toggle the switch on the PSU).

I had a Corsair 750W PSU in before and this did not happen with Windows 7 32-bit. When I changed the PSU, I installed Windows 7 64-bit. Now the problem happens.

In the bios, the standby modes are both S1 and S3.

Is the problem too little power (wattage), the bios standby mode, or Windows 32 vs 64 bit?
 
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I haven't messed around with Windows 7, so I don't know the default settings. That said, how are you attempting to "wake" the computer up?

If by keyboard for example, have you checked to see if it's a device that is allowed to wake the computer (control panel - keyboard properties - hardware - power management)?

I would also check any Energy Star settings (specifically under the advanced settings).
 
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I've tried the keyboard, mouse, and power button. None work.

In the bios, I have wake on: keyboard, pci, lan, modem, everything!

In windows, under the properties for the devices listed above, I've ensured that each can "wake the computer from sleep".

I'm beginning to think it is the power supply and will try swaping it out with one that has more juice.
 
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What makes you say that, considering the two hardware changes: PSU and Vid Card?
 
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based on your experience, i have a hypothesis:

your power supply needs to deliver a certain amount of electricity or else it enters a state where it needs to be turned off and then on. standby uses too little power, and so it enters this state. i'm having the same problem with an Atom 330-based motherboard and a Luxuriae noiseless power supply -- but like you, it's only with a 64 bit OS (in this case Windows XP).

 
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OK all your problem is simple to activate the sleep on those boards you have to move a jumper to activate the 5volts on your usb ports while in sleep. Their will be a jumper near the usb ports move it to the 2 3 position and your problem will be solved.
 
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are you leaving the cmos jumper in the 2-3 position, at least until you can get the unit up and running? I have moved the jumper, but only for 5-10 seconds like the manual says. My unit is frozen in hibernate - no way to get it to return to any activity whatsoever. Windows 7 64, asus mobo.
So, for the moment, I can't get to the bios, or any other driver repairs.

I suspect the power supply (cooler master 650w) but would like to try something else first.
 
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Okay, check this out. After talking with the company that modded my asus (xoticpc) i think i've found a solution.

Theres actually a magnet next to the trackpad that tells the computer when to sleep/wake. just rub a fridge magnet over it to reset it. i guess it's right by the lip of the computer on the left and right of it.
 
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I am havin similar problems on my computer dual OS: LinuxMint (Ubuntu) 32 bit and Vista 32 bit, takes up to 7-8 min to wake up from sleep. I tried 2 different AMD mobo +ATI 4870 GPU always with 650W thermal take PSU, tried S1, S3 and auto settings in bios, nothing helps. So I believe its the PSU problem. Now my question is does anyone know which PSUs are problematic, Im looking for 750-800 watt PSU. Thanks
 
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