Dead motherboard????

[Will01]

my friends pc isnt working so hes given it to me to have a look. i instantly though dead psu. but the 5v rail is clearly working as he told me his led keyboard was lighting up with the pc plugged in but it is totally unresponsive to a press of the power button. no psu fan no cpu fan or graphics card fan. ive checked all the basic stuff. rebuilt it to avoid any wierd problems. Im guessing dead motherboard right as its not even trying to turn the psu on when i press the power button or short the connector.

[ProjectBox153]

You suspect a dead motherboard, but have you tried switching the PSU to a known working one yet?

[Will01]

Just now, Jamiec1130 said:

You suspect a dead motherboard, but have you tried switching the PSU to a known working one yet?

oh yeah sorry i forgot to mention. used the one out of my pc which i know 100% works. its just like no activity to do with the system but the 5v rail is active as the keyboard lights up. its like it just wont trigger the psu to power it. but ive tried 2 psus.

[Swealteek]

If the fans trun and lights on. butt no singel.

 

A: its your cpu (dead or maby bios update)

B: fail save for powerdelevery (<- not 100% sure )

[oDoyoleRules69]

reset CMOS? always works for me whenever i have a problem. 

[Will01]

but it was working before. its been ages since i reset cmos. do i just take out battery for like 10 mins and then pop it back in and try the pc?

Just now, oDoyoleRules69 said:

reset CMOS? always works for me whenever i have a problem. 

 

14 minutes ago, Swealteek said:

If the fans trun and lights on. butt no singel.

 

A: its your cpu (dead or maby bios update)

B: fail save for powerdelevery (<- not 100% sure )

 

[oDoyoleRules69]

Also, look around for capacitors that may have blown up, sometimes theyre obvious, sometimes they're just kinda swollen.  Google for some pictures for reference. If thats it, they could be replaced

[oDoyoleRules69]

Just now, Will01 said:

but it was working before. its been ages since i reset cmos. do i just take out battery for like 10 mins and then pop it back in and try the pc?

 

 

on my MOBO i have to touch 2 pins with a screwdriver.  Google the model number and reset cmos

[Will01]

1 minute ago, oDoyoleRules69 said:

on my MOBO i have to touch 2 pins with a screwdriver.  Google the model number and reset cmos

well as i said in the original comment i already tried using a screwdriver to short the pins. i looked before and i cant see any damaged capacitors

[Swealteek]

22 minutes ago, Will01 said:

well as i said in the original comment i already tried using a screwdriver to short the pins. i looked before and i cant see any damaged capacitors

well a cpu can dea even if its rare.

 

Clearing cmos, how i do it is take out the cmosbattery. en uplag the pc form the wall (including Peripheral and monitor). than press the power butten for 2 min, than plug your pc back (including cmos)

[Will01]

32 minutes ago, Swealteek said:

well a cpu can dea even if its rare.

 

Clearing cmos, how i do it is take out the cmosbattery. en uplag the pc form the wall (including Peripheral and monitor). than press the power butten for 2 min, than plug your pc back (including cmos)

 

59 minutes ago, oDoyoleRules69 said:

on my MOBO i have to touch 2 pins with a screwdriver.  Google the model number and reset cmos

Tried the cmos. Still nothing. Plugged the psu into my pc and Insta turns on.