weird boot problem

[fl35h]

hi, my computer just started having this problem where it wont boot. if i hold down the power switch then then the power comes on and my case fans and lights turn on, but the PC doesnt boot. and if i let go of the button then it turns off. then i went back today and checked my PC and it wont turn on at all. not even if i hold down the power button. but the green light on my mobo is on.... so is it the PSU? its weird because it was working real well about an hour before this started happening. i was gamming at my brothers house and it was working fine there. but, when i brought it home it started having this problem. another thing is that it is quite humid here so that might have caused some problems. im not sure what part is bad or needs replacement so any help would be appreciated.


here is my system:
Antec 900 case
Asus P5N-E mobo
C2D E6750 2.66gh @ 3.2 gh
8800 GTS 640
550w PSU
2 gigs OCZ DDR2 ram

 

[Cutthroat]

Welcome to Anandtech.

You said you moved the PC, sometimes things come loose. Make sure all wires are plugged in tight and all cards are snug.

 

[fl35h]

thanks, for the welcome!
but i did check and everything is tight. nothing is loose

 

[Old Hippie]

.... so is it the PSU?

With those symptoms, that's where I'd be starting.

Good Luck!

 

[Paperdoc]

Just a quick and easy thing to try first. There's a switch on the back, on the PSU, that completely turns off the power, which the front-panel pushbutton does not do. Just turn off that switch (or unplug the machine) and leave it off for at least 30 seconds. Then turn it back on, and try the front-panel pushbutton, doing the normal "push and release". Sometimes the system gets locked into a wierd state it cannot clear unless it is completely powered down.

Next thought: you say you checked for any loose connections and all is well. Not sure exactly what you did. But the best way is to actually disconnect and reconnect everything. Sometimes the bad connection just is not visible, and this reconnect sequence cleans things off to fix a problem. Just be careful and don't bend or force anything. Oh, and I do NOT recommend doing this with the CPU unless you have a very good reason to think it is necessary!!

 

[fl35h]

ok well, im getting a new psu next week so i guess i'll test it then. thanks everyone.

 

[poisonthewell]

Try disconnecting the power to your hard drive and see if the system boots. My problem sounds similar to yours:

http://forums.anandtech.com/me...=2203514&enterthread=y

 

[fl35h]

ok well bad news, i got a new psu and plugged it in and still nothing. the led on my mobo is on but nothing happens when i press the power button. now im begining to think its my power switch connector. i tried to jump stasrt it with a screw driver but that did nothing. any ideas?

 

[BlueAcolyte]

You can test your PSU by sticking a bent paper clip into one of the green wires on the main connector and a black wire on the main connector.

 

[fl35h]

ok well i finally got a chance to do some work on my PC now. i got a new motherbord. ASUS P5Q - pro. installed it and when i hit the start button the lights and case fans go on. this is somewhat of an improvement from before because when i would hit the power button nothing would happen, and now the lights and fans work. but now there is another problem. i dont get any signal on my moniter. i tested it on another computer and the moniter is not bad. i also tested it with different cables. also i tried another graphics card (9800 GTX) and still the same thing.i took out all HDDS DVD drives and tried again but still nothing. no image. any ideas on what it could be?