The Mac Response Centre: Mac Repair Guides https://www.macresponsecentre.co.uk/blog/ Practical guides to Mac faults, repairs, upgrades and keeping your files safe. en-gb iMac screen flickering or showing lines? What it meanshttps://www.macresponsecentre.co.uk/blog/imac-screen-flickering-lines/https://www.macresponsecentre.co.uk/blog/imac-screen-flickering-lines/ Thu, 05 Nov 2026 08:49:26 +0000Lines or flicker on your iMac screen? A simple screenshot test shows whether the display or the graphics is at fault, and what to do next. MacBook on but the screen is black? What to checkhttps://www.macresponsecentre.co.uk/blog/macbook-black-screen-what-to-check/https://www.macresponsecentre.co.uk/blog/macbook-black-screen-what-to-check/ Thu, 05 Nov 2026 08:49:26 +0000MacBook lights up or the fan runs but the screen stays black? Safe checks to try at home, and how to tell a display fault from a logic board fault.