Hi
I removed the heat sink and fan and there wasn’t a speck of dust. I applied thermal compound and re-fitted it.
I replaced the backup battery.
The laptop started up ok many times.
The error had returned this morning though.
I turned the laptop onto it’s side and blew into the vent. It then started up ok again !
I wonder if there are certain positions where the fan cannot start ?
There are plenty of replacement fans for HP laptops on eBay UK but it isn’t clear if they would be compatible.
For example, this looks similar.
https://www.ebay.co.uk/itm/HP-17-X-Fan-17-x001ds-17-x012ds-17-x037ds-Cpu-Cooling-Fan-926724-001/163618800125?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D40732%26meid%3Db9a0f7f7a9654affb414260e754652cd%26pid%3D100675%26rk%3D2%26rkt%3D14%26sd%3D264451249105%26itm%3D163618800125%26pmt%3D0%26noa%3D1%26pg%3D2481888&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3Ae7905969-d879-11e9-bac6-74dbd1803b4b%7Cparentrq%3A39f4397d16d0aa4764741b6affaa5529%7Ciid%3A1
I have attached a picture of mine.
Thanks