No BIOS displayed, nothing

L

Lextar

n00b
Joined
Aug 12, 2005
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I built this PC a while back that worked fine, but not sure what I did, but when I switch it on, I get nothing. The power is supplied to the mother board (it has a LED to warn it got power) and the HD spins up, so does the fan.

But there is no signal to the Monitor and I think the BIOS does not even get displayed because if it was the graphics, you'd hear the HD booting up windows.

I leave this on for some hours, and hit reset... I don't do nothing... and it boots up fine, BIOS gets displayed and it works!!! A friend said it may just be a dry connection.

Now after several months, it stops working. So I buy a new mother board, new graphics card and memory... still the same thing.

Nothing gets displayed, not even the BIOS. I've tried a new PSU, but still nothing.

So the only thing left is the CPU. Now before I spend any more money... can the CPU be the problem??

I heard that if the motherboard touches the case, it sometimes prevent it from booting, but I'm sure it is not this.

Anyone any ideas before I spash out for a new CPU?
 
The first thing I would do is pull it out of that case and test it to see if it exhibits this behavior outside of the case. If the motherboard is shoritng out it could cause this type of problem

~ Novensu
 
Yeah, try building it outside the case. If it still doesn't work, then put a fork in it, it's done. Probably the CPU at that point. Been overclocking too much?
 
Lextar, welcome to the forum. :)

List your components by make so that the members may help you. For instance:

Mobo:
CPU:
Ram:
PSU:

Lextar said:
I heard that if the motherboard touches the case, it sometimes prevent it from booting, but I'm sure it is not this.
Click to expand...
True. This will cause a short between the board and the case and the power to ground, keeping the system from getting the proper power and may damage the motherboard.

But you've said that you're sure there is no metal-to-metal contact between the board and the case, except where the stand offs that the board is held on with? There should not be extra standoffs used if there is no corresponding hole on the mobo for it.

Even though you bought a new board, Strip your system down and remove the mobo from the case leave it on a cardboard box. Check that you have a “clean” case, no loose screws whatever laying around. It happens.

With only your PSU, CPU/HS/fan, mounted on the mobo on the box with your speaker attached, see if you can’t generate a beep code. Next try with an HDD hooked-up. It may be another component causing the problem, so start with the bare essentials and add as you test. If not, can you swap the CPU for another, a friends, to isolate that problem.

Without the means to swap parts, you can take it to a shop first and let them test for you. At least you'll know what possible new part you need to buy for certain.

Edit: And what the guys said above as I was typing, but not the fork. :p

gl :)
 
Okay, built PC with motherboard sitting on the static bag it came in, definately nothing shorting it and still the same thing. No signal to the monitor, no BIOS, HD spins, but no activity. :mad:

How much force can you apply to the CPU when you attatch the fan? The clips are hard (Socket A CPU) so I had to very much pry the last end of the clip onto the hatches. Can I damage the CPU like trying to put the fan on?
 
Alright. We were addressing the grounding matter brought-up. Moving on to Heatsink.

Yeah, The Socket A CPU is easily damaged and fragile with the die on top.

A screwdriver slip can also break small components on the motherboard that may not be readily visible to the naked eye. A slip can happen if you needed to install with that much force. In case, inspect the motherboard with a magnifying glass in good light.

Never push straight down on the heatsink, or rock it, the heatsink orienting correctly.

http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/23986.pdf

gl :)
 
Nope, new motherboard, so no scratches. Also used a long thin pliers to hold the metal clip and push it down onto the hatch, so no slip up.

However... I'm pretty sure I put the heat sink the proper way, but to get the first latch on, i tilted the heat sink towards the step side, so technically classed as wrong in the pdf, but it wasn't that much of an angle.

Oh well... looks like new CPU :mad:
 
oh poop... pretty sure it wasn't there when i moved it to the new motherboard. Looks like definate the CPU is dead. See scratch at the bottom of CPU

Pict2327.jpg
 
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