Hi Colif,
re PSU. The battery was preventing laptop from booting up, so I've been using laptop without battery inserted.
Specs are here: https://www.sony.co.uk/electronics/support/laptop-pc-vpc-series/vpcyb3v1e/specifications
AMD A50M FCH, AMD Dual-Core E-450 APU, PC3-10600 DDR3 SDRAM, AMD...