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Windows 7: My pc wont turn on

05 Aug 2012   #1
robbww77

Windows 7 Professional 32 bit
 
 
My pc wont turn on

it wont turn on at all, the PSU at the back has a lighted switch on the back that flickers so im thinking that might be the problem, pehaps theres no constant power going through.

ive changed the power cable and nothing changes so its not the cable

is this a faulty PSU or a lose wire inside?

can someone help, thanks


My System SpecsSystem Spec
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05 Aug 2012   #2
DocBrown

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

Hello robbww77,

Can you give us more details on your computer ? Make & Model ? Desktop or Laptop ? Brand of power supply?

Any pics that might help ?
My System SpecsSystem Spec
05 Aug 2012   #3
Dwarf

Windows 8.1 Pro RTM x64
 
 

It's more likely to be a loose connection inside the computer itself, probably the main motherboard connector (but check the others as well). If the PSU is modular or semi-modular, check the cables that you have to plug in on the PSU itself to make sure that they haven't worked loose. As regards the flickering light in the switch on the back of the PSU, these are typically neons and they can develop a flicker after a period of time (or they can have a degree of flickering from the onset).
My System SpecsSystem Spec
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05 Aug 2012   #4
robbww77

Windows 7 Professional 32 bit
 
 

its a desktop, and its a custom pc that i built online through a website

this is the back of my PSU, that green power switch keeps flickering


this is my PSU
My System SpecsSystem Spec
05 Aug 2012   #5
robbww77

Windows 7 Professional 32 bit
 
 

ive unplugged the wire running from the PSU to the motherboard, it was a little plasic square plugged into the mobo, i took that out and plugged it back in and it didnt fix it.

there is another wire running from the psu to the mobo...


the long one with the multi-coloured wires at the end, i havent unplugged that, is it safe to try?
My System SpecsSystem Spec
05 Aug 2012   #6
DocBrown

Win7 Enterprise, Win7 x86 (Ult 7600), Win7 x64 Ult 7600, TechNet RTM on AMD x64 (2.8Ghz)
 
 

With the power cord disconnected, unplug & plug back in the 24 pin MB power connector, check the 2 wire on/off switch that is plugged in to the MB switch header. Also I have had that front panel on/off switch to go bad & had to replace it.


Attached Thumbnails
My pc wont turn on-mb_header_panel.jpg  
Attached Images
My pc wont turn on-mb_power_connections_24pin_dual_4atx_gpu.png My pc wont turn on-mb_header_conn_leads.jpg 
My System SpecsSystem Spec
05 Aug 2012   #7
Dwarf

Windows 8.1 Pro RTM x64
 
 

My advice still stands. In addition, check the connections to the front panel switches, as loose connections will obviously render the switch(es) inoperative.
My System SpecsSystem Spec
05 Aug 2012   #8
robbww77

Windows 7 Professional 32 bit
 
 

i unplugged the 24 pin power connecter... this one


but still nothing


when you say check the connections to the front panel switches, do you mean take the front of the tower off and check the main power button?
My System SpecsSystem Spec
05 Aug 2012   #9
AddRAM

Windows 7 Professional x64 Service Pack 1
 
 

Do you have your power supply manual ? It just might tell you why it`s flickering , blinking etc.
My System SpecsSystem Spec
05 Aug 2012   #10
stormy13
Microsoft MVP

Win 7 Ultimate x64
 
 

Low quality, no name power supply. Best I can find on it is either this,

Evo Labs - Envizage Solutions Ltd - PCs, Components & Media Players at low prices

or them going for even less on fleabay. No specs, no reviews, no actual manufacturer website, nothing.

I have a feeling that that PSU may have up and killed itself likely due to extremely low end components in it. If that is what has happened, it is time for a new good quality power supply and not something that no one has ever heard of. Also if that is what has happened, the next hope is that when the PSU killed itself it didn't fry any other components in the computer.
My System SpecsSystem Spec
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 My pc wont turn on




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