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How can I reboot my acer M661? The power light is on but will not boot.

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From your brief diagnosis it sounds like a Power Supply problem. Weak voltage power rail.

1) ALL the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.
Depends on what Processor it is.

The Acer M661 has a variety of Processors that can be installed from the factory. (Acer)
A) Intel Core2 Duo
B) Intel Core2 Quad

http://support.acer.com/acerpanam/desktop/0000/Acer/VeritonM661/VeritonM661sp2.shtml

Depending on which Core2 Duo, or Core2 Quad, the Processor could use up to 65 Watts, or 105 Watts.

http://en.wikipedia.org/wiki/List_of_intel_core_2_microprocessors

(I don't think Acer would offer one of the Intel Core2 Extreme processors. Depending on the model, they can use up to 150 Watts)

With a Power Supply that is weak, it can produce enough power to turn on LED lights, and perhaps spin fans, but not enough power to turn the Processor on.

The M661 comes with a generic ATX 300 Watt power supply.
Acer is known to use low quality power supply's.

Solution would be to use a KNOWN to be good, Compatible power supply for a test.

[Compatible:
Has to have the correct form factor for the Power Supply.
It's an ATX form factor.
The size, and shape of the case of the Power Supply, is it's Form Factor.

ATX power supply form factor is approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall.

Has to have the correct power cables.

1) I don't have access to information for the motherboard, used in the Acer M661.
Can't tell you if a 20-pin ATX main power cable is used, or a 24-pin ATX main power cable.
A cursory glance inside your computer will net this info.

My guess would be a 24-pin ATX main power cable.
Example;

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

2) Has to have a 4-pin ATX +12 Volt power cable, or an 8-pin EPS +12 Volt power cable,

A) 4-pin +12 Volt power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

B) 8-pin EPS +12 Volt power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#eps8

The reason I made the above statements, is that you may have a working power supply, in a computer sitting around no longer in use. You could borrow this power supply for a test unit.

Posted on Sep 12, 2010

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1. remove the battery
2. Press power button now. keep power button pressed for 2 mins
3. Reseat the battery.

see if it works !.
Happy Computing. !!!
Else please aloberate.

Posted on Sep 12, 2010

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