Solved Monitor not detecting computer input.

December 23, 2013 at 18:01:04
Specs: Win 7 home 64 bit, I5. 8gb ram
Hello all, I have a dell Inspiron 580 (I'm in Europe if that makes a difference to models numbers/names)

Computer was working just fine until last Saturday. A lightening strike threw my house trip switch (not before broadband filter exploded and modem was fried, modem looks perfect but doesn't light up any lights after the surge).

Anyways after I got power back and rebooted my computer the monitor does not detect it anymore, the "no VGA input" box floats around the screen. The computer appears to be booting normally, all fans working, no error beeps, and I hear the windows music/sound for the login screen.

I have tried removing and reseating all components and have had no success. I have also tried the various display outlets, the graphics card ports (a Radeon card, can't recall exact model, but purchased and installed after bought computer) and mother board VGA & HDMI slots. Also tested computer on a different monitor, still no joy.

I'm not sure what I should try next and would welcome any advice.

Thanks in advance for any help.

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✔ Best Answer
December 24, 2013 at 16:19:12
You're getting the windows startup sounds so the motherboard must be OK or it wouldn't get to windows startup. It's got to be video card/adapter, monitor or monitor connection.

The beeps when using the on-board video may mean that adapter is shot and the surge may have affected the radeon card too.

December 23, 2013 at 23:28:06
If you currently have monitor connected to the Radeon card and getting nothing on the screen, my guess is that card has suffered damage from the lightning strike, hence no video signal. That card is now useless and needs replacing.

The integrated video chip (assuming it hasn't been damaged) won't work until you physically remove the Radeon card. Your computer BIOS disables the integrated one when a PCI one is present (even if it's been damaged).

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December 23, 2013 at 23:46:55
Less likely since you're getting the 'no VGA signal' but it could be the monitor. Have you tried it on another computer?

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December 24, 2013 at 02:04:41

Thanks for the reply. I hadn't tried the alternate display outputs with card unseated as you suggest. Unfortunately when I connect to the monitor from motherboard output with card removed I get 6 error beeps, a brief google suggests this means that my motherboard is cooked. Is this the case, or is there still hope?

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Related Solutions

December 24, 2013 at 11:30:02
How did you determine what the beep codes meant?

Do you know the BIOS version?

Do you know there are short and long beeps?

Real long shot, but try clearing the CMOS by either using the clr CMOS jumper, or removing the coin shaped CMOS battery for a few seconds. This must be done with the computer unplugged. Also wouldn't hurt to depress the start button a couple of times after unplugging the AC and before clearing the CMOS.

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December 24, 2013 at 16:19:12
✔ Best Answer
You're getting the windows startup sounds so the motherboard must be OK or it wouldn't get to windows startup. It's got to be video card/adapter, monitor or monitor connection.

The beeps when using the on-board video may mean that adapter is shot and the surge may have affected the radeon card too.

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January 7, 2014 at 14:28:40
I tried removing battery, depressing power button etc. no change in the outcome.

However now even with graphics card in I get the 6 beeps (short). Dell documentation says this indicates "video BIOS test failure".

Is it time to buy a new motherboard?

If so, a few questions:

1. Is it likely that my processor survived?

2. What's best way to test if old components are working while replacing parts? (I'm probably going to buy a new bigger case and start building a new computer but salvaging any parts that still work.)

3. This was all the result of a lightening strike (I also lost two cordless phones, modem and broadband filter on top of whatever the extent of the damage to my computer is). Is there such a thing as a phone line surge protector? And if yes, are they any good?

Thanks for replies thus far and any future info you can provide. Great forum.

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January 7, 2014 at 20:44:45
1) Processor must be OK since windows sounds indicate it's booting into windows.

2) Best way to test is to swap the questionable component into a compatible working computer or swap in a known working component.

3) I've heard of surge protectors for phones but have never used them. I'm sure they're better than no protection at all. An internet or ebay search should turn some up. A place like radio shack may have them too.

I'd swap in a known working compatible graphics card before giving up. For testing purposes it doesn't need to be anything fancy.

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January 11, 2014 at 11:30:13
Thanks for the help so far.

I've decided to invest in a new motherboard and will update the chip if necessary afterwards, I still believe it's working.

I'm not sure of the socket type I need though and can't figure it out.

My processor is an intel i5-750, and also has "2.66ghz/8mb/09b" on it.

I purchased it in 2010.

Am I correct in thinking that's it a first or previous generation i5? It doesn't appear to fit in a motherboard that supports 3rd/2nd gen core processors.

If so can someone recommend a good motherboard (in the €100-€130 price range)

Thanks in advance. If what I'm thinking of doing sounds totally stupid please let me know, I'd just like to salvage as many parts as I can.

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January 11, 2014 at 12:20:18
If you're looking to use the same processor on a different motherboard you need to check the processor support for whatever motherboard you're thinking of buying. I believe your cpu fits on a socket lga1156 but yours may not work with every socket lga1156 motherboard. I don't have a motherboard recommendation but others might.

Here's some info on that cpu:

Also with a different motherboard you'll probably need to reinstall windows or at least do a repair install as the first boot up on a new motherboard with the old drive will give a blue screen error.

message edited by DAVEINCAPS

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January 11, 2014 at 15:28:32
Thanks again for the reply..

Supported motherboards on that link shows up a 404 error. I don't know if that means there aren't any or not.

I'm unsure about how to proceed. Local shops have very limited inventory so I'll probably have to buy online, but if there's a strong chance that it may not work anyway I wonder if I'm wasting my time and money having to send failed trials back.

Anyone else familiar with the chip that might be able to recommend a board or give me a little more info to help make up my mind?

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January 11, 2014 at 16:36:47
Having done a little looking around it seems the socket I need really isn't available anymore. Sigh. If anyone can tell me I'm wrong I'm all ears.

But then it is 4 years old, that's computers for you I guess. Seems such a waste.

Anyways, I think I'll grab me a i5 4570s, I see one for €175. Is is safe to assume it will work with this motherboard? Asus P8 Z77-V LX2

I should thank the lightening strike for making me upgrade I suppose.

Also, first time I'm buying motherboard and processor, so feeling brave. I usually give in to my cautios side and just get a dell. But bought me a nice corsair case and gonna choose all my own parts from here on out.

Probably a lot more noobie questions to come.

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January 11, 2014 at 21:53:02
You might want to start a new thread to ask about motherboard compatibility. I don't really keep up with the newest technology but there are others who can answer your questions. A newer thread will be posted at the top of the list so others will see it.

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January 12, 2014 at 00:41:25
Great, I'll do that.

Thanks again for the advice.

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January 12, 2014 at 01:23:21
You're welcome. I hope you get the information you need.

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