Can a bad power supply affect pc parts

[jlohojo7]

My parents pc had the power supply go out and for awhile before it actually went out i could tell it was about to go. Now I have replaced the power supply and it turns on but now there is no signal coming from the VGA to the monitor what could be there problem could the bad ps have burned up the old VGA output on the MOBO ?? any other possible fixes ??

thanks
jj

[jlohojo7]

ok well I hooked up my new video card in their computer and i am still not getting any signal. But it does power on the fan thats on the video card ??

you think the mobo is bad ?? Any tips would be great !!

[Chewy]

are you sure you have all the connections from the power supply connected to the mobo?

if they are then looks like a bad mobo or cpu

[jlohojo7]

yea i am positive i have it in correct. Like i said i can get it to power up now bc before i couldnt but now just doesnt send out a video signal.

What trouble shooting should i go through next ??

[jlohojo7]

its a real simple pc they just use it for surfing they dont know how to do anything else you know the have trouble sending emails haha. so the onnly connections is the 20pin that 4 pin yellow and black power to the HD and power to the 2 dvd drives. not much you know. if you think its bad whats a cheap one i could pick up for them all they do is surf

[Chewy]

what's the mobo? model/brand of computer?

[jlohojo7]

Its a ECS PM800-M2 its a custom build job

[Chewy]

4 pin yellow and black power to the HD

goes to the motherboard , 4 pin square socket next to the regular power connector, close to the usb back ports 2 yellow 2 blacks

[jlohojo7]

yea i put the 4pin yellow and black right next to the 20pin

[Chewy]

unhook all drives and all fans except the cpu one

see if it will post?

eliminating possible shorts

checking the new power supply in another computer also

this stuff gets real hairy fast

[jlohojo7]

k i gotta head into town ill let you know what i figure out later thanks for all the help so far !!

joe

[jlohojo7]

well i unhooked everything but the cpu fan and still nothing!!! starting to get a lil frustrated why all the sudden the power supply goes and does the mobo mess up ??

I have tried 3 different power supplys and i know for a fact that 2 work but in all 3 when plugged into the mobo that there is a faint whistle coming from the power supply what does that tell you!!!

[Chewy]

I have had mobos eat cpu's and vice versa, mobo's eat ps's and vice versa

ecs is one of the worst mobo manufacturers

[jlohojo7]

i can get spare parts for free where i work what should i try first what would be your first guess

We know that the ps is good so thats fine

[Chewy]

mobo is ifffffffffffffy

cpu should be good unless it shows overheating(pattern where the heat transfer compound melted and flowed down) fried?