On Tuesday, 28 November 2023 15:49:10 GMT Daniel Frey wrote: > On 11/28/23 03:38, Michael wrote: > > Over the last 8-9 months I noticed an old Lenovo G505s laptop is spending > > a > > long time in the POST process, before eventually the OEM logo shows up on > > the screen. Last time I timed it, it took 2.5-3.0 minutes. Normally it > > would only take ~20-30 seconds. Once the logo shows up the boot process > > proceeds without further delay. > > > > Initially, this delay to POST would happen randomly and rarely. Now it > > happens every time. > > > > Things I tried: > > > > 1. Reflashing the UEFI firmware - it didn't work because it already has > > the > > latest firmware. > > > > 2. Removing the main battery and holding down the power button for 15 > > seconds, hoping to reset the firmware. > > > > 3. Leaving the PSU cable connected overnight. > > > > 4. Testing the RAM and HDD. > > > > None of the above improved the situation, or indicated what might be > > wrong. > > > > I'll reseat the RAM sticks and the HDD next, in case a contact is > > oxidised, > > but what else could cause this noticeable delay to POST? A failing RTC > > CMOS battery? > > We have had a few of these at work and these symptoms were cured by a > new CMOS battery. The voltage on the battery has likely dipped to > 2.9-3.0 volts; they get unreliable then (i.e. it's dead.) If you leave > it long enough you'll start getting RTC errors on POST. > > I'd try that first, assuming you can still get the CMOS battery for these. > > Dan
Thanks Dan, will do. I was planning to take it apart soon to replace the HDD with an SSD, so this would be the first thing to check. I expect finding a replacement unit will be difficult. Every Lenovo RTC battery seems to have a different part number.
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