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"Please Stand By" now computer won't come on!

Ok this is one of the WEIRDEST things i have ever experienced at the desktop level.

I'm on my home machine a few minutes ago, just plugging along. and suddenly i get a "Please stand by" Like the computer is going into sleep mode.  Then it shuts off.  Now I can't turn it back on.  I reseated power connections, flipped the rear switch back and forth.  When I open the box there is a Green LED lit on the motherboard indicating power.  But the computer simply won't turn on.  I don't have a power tester anymore.  Don't really want to start test swapping power supplies.  To me it doesn't seem like a power supply problem!  with the LED lit on the motherboard..

The machine simply will not power back up.

any thoughts?
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Brent92663
Asked:
Brent92663
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5 Solutions
 
Brent92663Author Commented:
update.. gound power supply tester, nothign coming out when i hit the button,  must be the switch?? right?? but why would it say "please stand by" if i was having a hardware failure?  why wouldnt it just not work next time i pressed the button?  is it the switch? sigh   thoughts?

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Brent92663Author Commented:
Update.

Was just about to go to the store to buy a switch,, when i turned the power switch off on the back.. when i hold the power switch on the front down i can hear the discharge of electricity telling me the power switch on the front is fine..  SO

I have a computer that won't power on, that has a good power switch,,  so that leaves the Powersupply?   Maybe the computer went into standby, maybe i had the ups service runnign and i didnt know it?  I dunno..

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mjcoyneCommented:
It does sound like the PSU died, but it might also be that one of the capacitors on the motherboard or a MOSFET died.  I don't know why the OS responded to the power change, but that behavior is usually associated with the switch...

You're getting the green LED on the motherboard, right?  Do the drives spin up and the fans come on?  I'd try a few things before spending any money, like clearing the CMOS, booting from a floppy or a knoppix CD, making sure the motherboard hasn't shorte to the case (did the computer get jolted?), etc.
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tfjeffCommented:
I would advise to take the following general steps:
remove all expansion cards, remove all memory, disconnect psu from everything except the mobo (disconnect it from hard drives, cd drives, floppy drives, extra fans and lights, etc), disconnect everything else from the mobo (extra fans, but NOT the processor fan, all drives, any wires that run to things like front usb ports or front audio jacks, etc.)Reseat the processor, clear the cmos (as stated by mjcoyne), then try powering up again.  Also, I'm not sure why you think the on/off switch on the front of the case is OK...I'm not familiar with being able to "hear the electricity discharge"....if the above doesn't work, try bypassing the switch completely....all you need to do to bypass the switch is disconnect it from the mobo.  Take a screwdriver or something else metallic and short the two connectors that the power button was plugged into, then take it off...if the system is working, this should turn it on (be very careful not it short it against any of the other leads)...to shut it back off, short the leads again.  About the green light on the mobo, although this would seem to indicate the power supply is ok, it doesn't necessarily mean that.
good luck, jeff
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David523Commented:
The two most likely sources of a totally dead machine (No Signs of Lafe) are the Power Supply and Motherboard.  If the above suggestions from mjcoyne and tfjeff don't reveal a soulution and the Power Supply is considered good then I'd focus on the Motherboard.  The senario you've provided would make sense if the power saving switch is electronic and on the motherboard.  (i.e. The button is on the case but the actual switch is integrated into the board.)  A motherboard failure does seem to answer your questions BUT the previous suggested solutions are good and should be attempted before a motherboard solution is made.

Hope this Helps!!!
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rindiCommented:
Often a PC shutting down when in use is caused by the CPU overheating. Normally you may hear a siren-like whine when this happens, but that isn't  compulsary. So I'd first remove the heatsink from the CPU, clean both surfaces and also make sure the fan runs smoothly. Then add just an idea of thermal transfer paste and reattach the heatsink very firmly. If this isn't the case your mainboard could be faulty. Look for bad capacitors (signs of bulging/leaking/cracking).
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Brent92663Author Commented:
Hey guys, picked up a new PSU last night, the PSU was definatly bad...  However, I now get power but no video or anything.   I am going to RMA the mobo and hope the processor is okay.

The processor definatly didnt overheat, I have excellent cooling.
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mjcoyneCommented:
This is sounding more and more like you got zapped by a power surge or something.  Do you have a surge suppersor on the line?  Do you know that the video card survived?  Do you have another one you can swap in?
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Brent92663Author Commented:
I have a rack mount power line conditioner(very high quality), would be crazy if it was a surge somehow, though it has crossed my mind.   And nowhere else to plug my pci-e in :( ..  I'm pretty sick of hardware, tempted to throw it all out and buy a dell with a 3 year warranty and let them deal with it next time..

Anyone wanna buy a dual core amd, 3 gig ram w/ pci-e nvidia 6800 w/a  a beautiful antec case with 120mm whisper quiet fans? That is, well,, not functioning, but 100% under warranty? :)

Ok so I don't mean it yet.  Waiting for Asus to review my request and give me an RMA number.


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mjcoyneCommented:
With that kind of line conditioning, I guess that kind of minimizes the risk from an outside current power surge (provided the supressor is still supressing -- how old is it?).  So now the senerio is that the PSU went, and we're hoping that it didn't take out any other components with it?  I'm still curious as to why the OS reacted like it did...?
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Dark720Commented:
have you tried removing the power cable from power supply, try to turn machine on with no power cable connected (to drains all caps etc, you will see grenn led go out at this stage), wait 10 minutes, put power cable back in and see how it goes.
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Brent92663Author Commented:
Update:
Still waiting for my mobo to come back from RMA
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David523Commented:
:-)
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Brent92663Author Commented:
ive had it with this box,,, new psu, RMA motherboard,, im done not worth messing with it anymore for my time..  bought a dell with a 3 year warranty haahha.. thanks for the help guys.

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