Flat CMOS Battery

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Hamperking68

Hamperking68

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Jan 3, 2015
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Been having a problem with my PC. Strangely when I turned it on 3 days ago and it said there was no bootable media. I removed all drives except the boot and it worked however this morning even with just the boot drive installed it wasn't recognising and device. I reset the CMOS and it worked however it now wont recognise my Second HDD or DVD-R I'm thinking maybe it's a Dead CMOS battery. Any thoguhts? (Doesn't look to be anything wrong in the system time.)
 
Solution
Onus
The battery is most likely a common CR2032. Its number will be etched on it, and should be easy to find. Walmart, Home Depot, Lowes, and mass-market pharmacies are all likely to have it for $3-$5.
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junkeymonkey

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Nov 11, 2013
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start simple - check your sata cables some times they loose connection out of the blue and some times you may need to replace them [I had to replace one about 4 months ago due to this kind of issue ]

if your board is older it may be corrupt or failing controller [worse case ] I recheck all cables to the units in question
 
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Onus

Onus

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Jan 27, 2006
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He has reseated cables. "Forgetting" its configuration, even with +5VSB, can indicate a dying CMOS battery. The clock doesn't always wander, especially if +5VSB is present. For $4-$5, getting a new battery is cheap diagnostic, especially if the system is a few years old. How old is it?
 
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junkeymonkey

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still could be a bad cable as I said wiggling them around may not work you have to change out to a ''new'' sata cable..

at worse if the battery was dead all that could do is default the bios not make drives disappear from the list in the bios

then I guess your 100% sure the psu is still powering the devices ?? [1] device not powered ? - [2] device gone bad ? - [3] sata cable bad ? - [4] boards sata port bad ? - [5] boards controller bad ?

if alls good the devices should be listed in the bios '' Strangely when I turned it on 3 days ago and it said there was no bootable media ''

now if the battery was dead and reset the bios back to default settings you may need to go in and set the sata controller back to ahci if windows was loaded on that setting if so I will not boot on ide whats default sata setting settings are listed as [ide -ahci-raid]
but with that the devices are fully recognized in the bios as normal ?? so is it that it don't boot or is it the drives are not listed in the bios anymore ??

good luck
 
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