Tinkered with PSU fan and now PC won't even POST

[chiggachu]

Here's the scenario:

I changed the fan in my enermax 351p-ve from the stock fan to a panaflo L1A and i removed the secondary 92mm fan (as suggested by silentpcreview.com). After reinstalling the cables and everything back to normal, the system won't even post. The power button starts the system, but nothing appears on the monitor and all of the drive lights including the HD led stay lit and the system just sits there. The PSU seems to be functioning normally because the new fan is spinning and I am getting power for sure.

Any help is seriously appreciated. I don't want to have to get a new power supply because I killed mine trying to make it quieter!

 

[Zepper]

While it is sitting there running but with black screen, try pressing the reset button and see what happens. If it does start up then, it is probably the 'power good' line gone bad so resign yourself to pressing the reset button on each startup (basically what the PG line does automatically). If not, try the following as the jostling involved in working on the PSU could have turned a marginal connection into a faulty one (particularly of the AGP video card):

Boilerplate-01:
. Common causes of failure to boot (no video, no beeps) assuming PSU isn't totally dead:
1- RAM, CPU and/or AGP video card not seated properly, a bent pin or corrosion.
2- Drive data cable on upside down or only on half the pins or shifted a pin or two (usually Floppy or Zip drives).
3- CMOS needs to be cleared (AC power must usually be disconnected or . attempts to clear CMOS may fail) Unless your mobo does not use a power-off CMOS clear - check your mobo manual for specific info.
4- On some new mobos there is a CPU protection feature (esp. on Asus/Asrock Athlon/Socket A mobos) that will not allow the system to start if there is no fan (or a fan without a working speed sensor wire) connected to the fan power connector on the mobo (specifically marked "CPU Fan"). If you tried to start your machine without a fan properly connected, you have to attach a proper and working fan and clear the CMOS before it will boot.
.bh.

 

[chiggachu]

the reset button does nothing, not even reset. I have to hold the power button to shut it off. i will check all connections and reset the cmos (can this harm my system?)

 

[chiggachu]

Still not working...Conclusions as of now:

1 - cpu should be properly seated, as I didn't really touch it or the heatsink/fan while changing stuff. I don't really want to undo the heatsink and reapply thermal paste. RAM and video card seem like they're ok.
2 - all drive cables are properly oriented (red line towards pin 1) and seated...i'm only trying to boot with a floppy and cd-rom and still no response.
3 - cleared cmos (at least I think I did) by unplugging AC, removing the battery for 10 minutes, putting it back in and then moving the clear cmos jumper into the enabled position for 10 seconds. Am I doing this correctly?
4 - my motherboard doesn't require a fan in the cpu_fan socket (i never had one in there before I this problem appeared).

Any other suggestions? Surely my PSU can't be F'd if i'm getting power to it all, right? Could I have killed my motherboard?

 

[chiggachu]

STRANGE REVELATION

The video card is not powering on...well at least I don't think it is. The fan on the video card does not spin when I turn it on. I removed it and reseated it, but unfortunately I don't have another system or video card to test with. Could this prevent my system from POSTing and be the root of my problems?

 

[nick1985]

Originally posted by: chiggachu
STRANGE REVELATION

The video card is not powering on...well at least I don't think it is. The fan on the video card does not spin when I turn it on. I removed it and reseated it, but unfortunately I don't have another system or video card to test with. Could this prevent my system from POSTing and be the root of my problems?

you should get a video error beep. 1 long followed by 2 short beeps i believe.

 

[chiggachu]

that's if my video card isn't working? because now i'm pretty sure the video card is the problem, seeing as I removed all other components except for 1 stick of ram, cpu and the video card. The damn fan doesn't spin up, does that mean it is fried or just not seated well?

 

[Budman]

you probably needs that 92 mm fan to start-up,it's not detecting it so it thinks it's dead so no power up.

have you tried putting that fan back on?

Just a guess...

 

[chiggachu]

I think I figured it out. Tested with a different PCI video card and it posted and everything went fine. I think I must have fried my sapphire radeon9600 pro somewhere along the way. I have no clue how, but I didn't drop any screwdrivers or even touch the video card in the slightest. could it just be the agp slot? why oh why would this happen to me?

 

[acer1]

The EXACT same thing happened to me with my tagan power supply(all lights were lighting up, but nothing on the screen). I then switched power supplies with a old one I had and everything worked fine. Still have no idea what happened to my tagan, any ideas would be helpful.

 

[ScrapSilicon]

Originally posted by: acer1
The EXACT same thing happened to me with my tagan power supply(all lights were lighting up, but nothing on the screen). I then switched power supplies with a old one I had and everything worked fine. Still have no idea what happened to my tagan, any ideas would be helpful.

insufficient power output could be the trouble..

 

[acer1]

"insufficient power output could be the trouble.."

Meaning my new tagan is a hunk of junk?

 

[ScrapSilicon]

Originally posted by: acer1
"insufficient power output could be the trouble.."

Meaning my new tagan is a hunk of junk?

meaning what I said ..might of been marginal to begin with and now is incapable of handling the load..tagan and tagan
as always..ymmv
test the psu on another system..