Computer comes on, no boot, blank screen

[A+ Computer S&R]

Motherboard: ASUS M2N-SLI Deluxe
CPU: AMD Athlon 64 x2
PSU: Thermaltake ThoughPower 1200w

Ok, so I got this computer that was already not booting. I put a diagnostics card on it and it showed NO-C, which of course means no cpu. So I buy another cpu to go in it and try it again, again it won't boot and shows NO-C. So I decide to buy another motherboard thinking that it was maybe a short in the mobo. Install it and again no boot and show NO-C still. My only guess is now that it is the power supply but wanted to get some else's opinion on it before I decide to put out anymore money for a part I might not need. Thanks in advanced for the help.


Thanks again

 

[PCX]

Have you run any other sort of diagnostic tests?
HDD or Memory?
What do you mean it wont boot?
Does it not display anything past the bios? (assuming the blank screen is after the bios)
Does the bios show there is a hard drive? (assuming the blank screen is after the bios)
Does it display the bios at all?

You need to give way more detail to your problem and what you have done or have not done to resolve the issue.

 

[Rob_NNCC]

get some else's opinion on it before I decide to put out anymore money for a part I might not need.

Um, if you are a repair shop, you would have a test PSU and if you don't have one, you should get one.

Have you tried: Just the PSU, Mobo and CPU out on your workbench with nothing else plugged in, not even RAM?

Resetting the CMOS RAM?

 

[nlinecomputers]

Always test the PSU first. Bad power can cause any kind of reaction.

 

[PCX]

+1 for PSU and CMOS. I have seen both of them do weird things.

 

[A+ Computer S&R]

Have you run any other sort of diagnostic tests?
HDD or Memory?
What do you mean it wont boot?
Does it not display anything past the bios? (assuming the blank screen is after the bios)
Does the bios show there is a hard drive? (assuming the blank screen is after the bios)
Does it display the bios at all?

You need to give way more detail to your problem and what you have done or have not done to resolve the issue.

The memory and HDD are both good, I have tested them out on other computers.
When I say that it doesn't boot, I mean that when I turn it on the fans, lights, ect. come on but it just comes up with a blank screen. I have tested the graphics cards in it as well so I know it's not that.

Um, if you are a repair shop, you would have a test PSU and if you don't have one, you should get one.

Have you tried: Just the PSU, Mobo and CPU out on your workbench with nothing else plugged in, not even RAM?

Resetting the CMOS RAM?

I don't have a PSU of this type because in the area I live in no one really has a custom build computer, they just buy whats at the store. This one was given to me by a relitive who lives a good distance from me and always gets his computers costume built.

I have tried the mobo with just a bare but not out of the case yet. Will pull it out this evening and see what happens.

I have also cleared the CMOS to default but havn't flashed them. Was thinking it maybe be more of a PSU issue.

Always test the PSU first. Bad power can cause any kind of reaction.

Yeah, I was wanting to do that but since the computer now belongs to me and I already bought the mobo and cpu I wanted to insure that others were on the same track before I buy a part that I might not need.

 

[nlinecomputers]

Most of the PCs on the market will take a standard ATX PSU unit.

http://en.wikipedia.org/wiki/ATX

Even if you get the odd unit who's physical shape isn't ATX standard they usually are still the same pinout on the plugs. So you can still for testing purposes attach your standard PSU into the mobo and test with it. Then you know if you have to buy a non standard PSU.

Now there are exceptions to this. Some older Dells have proprietary power supplies that have different Pin outs. If you plug in your standard PSU into one of those units you set it ON FIRE! Check your pinouts first.

 

[nlinecomputers]

Also a good tech will have one of these:

And one of these:

 

[PCX]

The memory and HDD are both good, I have tested them out on other computers.
When I say that it doesn't boot, I mean that when I turn it on the fans, lights, ect. come on but it just comes up with a blank screen. I have tested the graphics cards in it as well so I know it's not that.




I don't have a PSU of this type because in the area I live in no one really has a custom build computer, they just buy whats at the store. This one was given to me by a relitive who lives a good distance from me and always gets his computers costume built.

I have tried the mobo with just a bare but not out of the case yet. Will pull it out this evening and see what happens.

I have also cleared the CMOS to default but havn't flashed them. Was thinking it maybe be more of a PSU issue.



Yeah, I was wanting to do that but since the computer now belongs to me and I already bought the mobo and cpu I wanted to insure that others were on the same track before I buy a part that I might not need.

Still could be the CMOS Battery and as nline has already stated, you need to keep an extra PSU around for troubleshooting purposes as well as a PSU tester and multimeter.

 

[nlinecomputers]

To me this sounds like a bad 12V rail. You have plugged up the 4 Pin or 8 pin 12volt plug near the CPU?

 

[NYJimbo]

PSU: Thermaltake ThoughPower 1200w

Remember, just because they put in a monster PSU doesn't mean you have to when testing.

If you are only concerned about a bad cpu and motherboard then any 400watt PSU will be more than enough for an Athlon like that. Just don't hook up the rest of the power robbing stuff thats in the system.

ps - diag cards don't always tell the truth.

 

[compnet]

one video card, am2, ddr2, and a 1200W P/S??? lol

new board, new cpu, tested ram, tested video card..

My guess is 2nd board was DOA, or P/S is bad.

 

[A+ Computer S&R]

Oh wow, well you will all be happy to know that I have fixed the problem. I got to taken the PSU out to test it after I went to the local store and bought a multimeter (something I have been meaning to get) and just happen to see a little tiny button that was hidden away on the case (hard to see because of where it was at). Looking more closely at the button I noticed that the button was pushed down so hard that it was caught on the case (it belong to a 60 year old relitive, you know how most older people are.) So I took me a small screw driver and caught the side and slipped it out and poof, started working It just amazes me sometimes at the small problems that can cause a computer to mess up. Anyway thanks for all the help, you all did a great job with the advice.

 

[dond]

and just happen to see a little tiny button that was hidden away on the case (hard to see because of where it was at). Looking more closely at the button I noticed that the button was pushed down so hard that it was caught on the case (it belong to a 60 year old relitive, you know how most older people are.)

Hey I'm 64

 

[A+ Computer S&R]

and just happen to see a little tiny button that was hidden away on the case (hard to see because of where it was at). Looking more closely at the button I noticed that the button was pushed down so hard that it was caught on the case (it belong to a 60 year old relitive, you know how most older people are.)

Hey I'm 64

lol that's why I said most, not all