No signal to monitor when computer starts up.

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gwest77

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Dec 30, 2012
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I have a HP Pavilion a6700y desktop I was upgrading. Also I was reading on the forums at this website where a guy had put a AM3 cpu in his computer with no bad results. I had the AM2+ in mine so figured he had no problem neither would I. Computer worked great for a couple of days and then shut down one day while I was using it. So I restarted and went about what I was doing. A little while later it did it again, this time a small blue screen came up but I couldn't read what it said because it disappeared so fast but remember seeing something about the BIOS. Now when I turn it on I only get a blank screen, no signal. Can someone please help me. I've tried everything I know to do. Thanks.
Greg
 
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ProficientInMath


Does your Mobo have a boot error code lcd display on it? If it does check the codes that are displayed when you try to power on the PC which will offer you some insight into what is causing the issue. Code descriptions can usually be found in the manual or on the manufacturers website.

I would keep the original system components installed and try a CMOS reset. Unplug the PC and press the CMOS reset button that should be on the back IO of the mobo and slightly recessed. After the reset try to boot again and see if...
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sancho_mic

sancho_mic

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Assuming that the mobo does support properly that CPU, it could be the PSU - AM3 requires more power than AM2+, maybe has higher frequency?
try removing all unnecessary from power and data, including HDD, CDROM, or other devices that you might have. Leave your motherboard & CPU only with RAM & GPU.

Also, try a hard reset (keep power button pressed after your PSU power cable was disconnected)
Also a clear cmos if hard reset not working.
-s
 
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ProficientInMath

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Using a CPU that is not listed as compatible with the socket that you have by the manufacturer is always a bad idea even if someone else had success doing it. AM3 processors have 941 pins while AM2+ socket has only 940 slots. The first thing you could try is updating your BIOS with the latest version from your mobo manufacturers website. You will need another computer and a flash drive for this, but if your PC won't POST then this is not an option. If that doesn't solve it then I would recommend reinstalling the original AM2+ processor to see if your system will boot and load Windows because that extra pin on the AM3 processor could be causing a problem since it has no slot on an AM2+ socket to relay the required electrical current to and from. Check the AM3 processor for any bent or missing pins when you remove it since placing it in an incompatible socket could have damaged the pins. If the PC does not boot with the original AM2+ processor then you may have caused permanent damage to your motherboard by installing an incompatible processor.

Hope this helps!
 
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gwest77

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Dec 30, 2012
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sancho_mic, thanks for the fast reply. I know the AM3 chip used more power but the specs on my computer said it could handle it ok. I've tested the power supply and everything checked out. I will try the hard reset and see what happens. I'm thinking the BIOS got messed up some how and I'm going to try one other thing it says on the HP site and hope it works.

 
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gwest77

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gwest77

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ProficientInMath
Thanks for the input. I did take it back out and put the original one back in. I even took out all the other hardware I was updating it with and put back all the original stuff. Still the same problem.
 
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gwest77

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Dec 30, 2012
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ProficientInMath

ProficientInMath

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Feb 5, 2016
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Does your Mobo have a boot error code lcd display on it? If it does check the codes that are displayed when you try to power on the PC which will offer you some insight into what is causing the issue. Code descriptions can usually be found in the manual or on the manufacturers website.

I would keep the original system components installed and try a CMOS reset. Unplug the PC and press the CMOS reset button that should be on the back IO of the mobo and slightly recessed. After the reset try to boot again and see if you can at least get into the BIOS. If you can get into the BIOS you can perform the BIOS update with a flash drive and then see if you can get into Windows.

You could also check to see if your mobo has a dual bios switch in the specifications. You can also check the mobo itself. It will look like a small RC power switch with a '1' and a '2' labeling which BIOS is selected. If your mobo has this then you can use this switch to load the 'backup' version of the BIOS in the event of a BIOS flash error or BIOS corruption to see if your BIOS got corrupted. If it boots with the backup BIOS then re-flash the corrupted BIOS with the latest version and the problem is solved.

If still you still can't get into the BIOS try connecting only the essentials: Mobo and cpu power connectors, a graphics card and monitor, 1 stick of ram, keyboard, and mouse with the original AM2+ CPU. No HDDs, SSDs, or any other boot devices and only the keyboard and mouse should occupy any usb slots. Also disconnect any of the front IO connectors. If you can get into the BIOS then your mobo is still viable and it may be an issue with one of your DIMMs, a boot drive, or an IO malfunction.

If this still doesn't work then I hate to say it but you may have damaged your motherboard.

Cheers,
Mike

 
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gwest77

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