Answer to: acer aspire 5735z power on for 20sec and off without displayAfter finding no love on the issue by diligently searching. I proceeded to breakdown the entire laptop and testing as I removed piece by piece. I eventually got a full boot after pulling the CMOS battery. I replaced it for good measure as I had already fully disassembled the laptop. The CMOS battery is the typical CR2032, I only had a CR2025 on hand (it is slimmer, but the negative spring was strong enough to not cause me concern). Disassembly guide here: http://tim.id.au/laptops/acer/aspire%205... Everything works fine now.