CPU or Mobo dead

[erjohnz]

My PC doesn't turn on, the fans (all fans including PSU's) only run for half a second then stops.
No beeps or anything.

I took off my stock Intel fan from my motherboard this morning to clean it from dust.
After that, I noticed that its thermal paste was already worn off and I didn't have any thermal paste at that time.
Ignoring it, I put the fan back and noticed that one of its "clip" or "lock" was a bit bent maybe because it was too old, so when I placed it, it didn't much locked itself to the board.
Then after plugging the power on the wall and turning it on, for a few seconds, a burning smell came up.
I quickly unplugged the power on the wall.
I removed the fan to check it, I smelled it and its the one with the burning smell. (The part where you put the thermal paste on)
I also smelled the CPU but it doesn't have much smell compared to the fan.
I checked the CPU for any burn marks, bent pins, etc. but it's all perfectly fine.

I already tried replacing the fan with a new one, and I reapplied a thermal paste, but that didn't helped at all.
Removing the CMOS or even the RAM didn't do anything at all.


Now, I don't know whether I should replace the CPU, the mobo, or both.

My very old specs are:
Intel Dual Core E5300
Kingston DDR2 PC800 2Gb
Asrock G31M-S r2.0
Win 7 32-bit

[KaptCrunch]

sounds that you shortted something out or had no heatsink connection cooked your cpu

[LoTech]

Can you test the cpu in another motherboard, say a friends? If that doesn't work then try his motherboard/cpu in your setup.

[dandelioneater]

I wonder if the fan itself was what burned? even if one of the hooks on the cpu heatsink wasn't engaged, the other 3 should have provided enough contact to the cpu. Do you have a little speaker that you can connect to the speaker pins on the bottom right of the motherboard? It should give some beep codes to tell you what may be wrong. That's all I can think of.

[erjohnz]

UPDATE:

I found out the problem, it's the 4-pin connector that was shorten out.
Everytime I connect it to the board, my PC doesn't turn on.
But when I unplug them, my PC turns on including all the fans, but there are no beeps or anything.

My PSU has two 4-pin connectors, and both of them are now broken.
Are there any way I can fix it? :(

[enaberif]

Originally Posted by erjohnz

UPDATE:

I found out the problem, it's the 4-pin connector that was shorten out.
Everytime I connect it to the board, my PC doesn't turn on.
But when I unplug them, my PC turns on including all the fans, but there are no beeps or anything.

My PSU has two 4-pin connectors, and both of them are now broken.
Are there any way I can fix it? :(

If your talking about the 4 pin ATX connector at the top of the board you have 1 of 2 things wrong. Either your board is toast (Most likely) or the psu is bad.

What brand of PSU is it?

[KaptCrunch]

Originally Posted by erjohnz

UPDATE:

I found out the problem, it's the 4-pin connector that was shorten out.
Everytime I connect it to the board, my PC doesn't turn on.
But when I unplug them, my PC turns on including all the fans, but there are no beeps or anything.

My PSU has two 4-pin connectors, and both of them are now broken.
Are there any way I can fix it? :(

if have no manual of stuff your working on, best use some masking tape and mark connections

#1 / #1 4pin left

#2 / #2 4pin right

so that they go back same place also some times wires are all same colour so you need a multimeter to ID them and socket pinout diagram



just get another PSU an hope that MB was stronger then PSU

[erjohnz]

Originally Posted by enaberif

If your talking about the 4 pin ATX connector at the top of the board you have 1 of 2 things wrong. Either your board is toast (Most likely) or the psu is bad.

What brand of PSU is it?

My PSU is Antec Neo Eco 520W
The 4-pin connector has its yellow wire a bit open because it was shorten out
Can I just use an electrical tape to fix it?

And another thing, when I don't plug in the 4-pin connector, my pc opens including all the fans,
but no beeps or any display on the monitor.
Is this just because the 4-pin isn't connected? Please correct me if I'm wrong

[enaberif]

Originally Posted by erjohnz

My PSU is Antec Neo Eco 520W
The 4-pin connector has its yellow wire a bit open because it was shorten out
Can I just use an electrical tape to fix it?

And another thing, when I don't plug in the 4-pin connector, my pc opens including all the fans,
but no beeps or any display on the monitor.
Is this just because the 4-pin isn't connected? Please correct me if I'm wrong

A system will NOT post if the 12v ATX connector is not plugged in.

Some boards come with a 8pin connector on it of which 4 pins can be used and the other 4 are not needed. But if you aren't hooking anything up to this connector then your system will NOT post.

Are you 100% sure you are putting the proper cable in?

[sf101]

my guess board is dead or psu or both.