HP 655

Problem: screen. First step: check it with an external display. Then we know everything else is working OK, but that the screen is definitely a problem.

• message from Graham: power light but no screen
• power drain didn't solve anything
• check it with external display first if possible
• nothing on external display
• https://supportvideos.ext.hp.com/detail/video/4251920134001/how-to-fix-an-hp-laptop-with-a-black-screen
• https://support.hp.com/gb-en/document/c03518165
• HP 655 / B6M63EA
• Processor Speed 1.4 GHz
• 2Gb RAM
• AMD 1400 MHz
• Portable Radeon HD 7310
• Item model number B6M63EA#ABD
• Series 655 B6M63EA
• Item Weight 2.5 Kg
• Form Factor Portable
• Screen Size 15.6 inches
• Processor Brand AMD®
• Processor Count 2
• RAM Size 2048 MB
• Computer Memory Type DDR3 SDRAM
• Hard Drive Size 320 GB
• Hard Disk Technology HHD
• Graphics Chipset Brand AMD
• Graphics Card Description Radeon HD 7310
• Wireless Type 802.11b, 802.11g, 802.11n
• Number of USB 2.0 Ports 3
• Supported Software Microsoft Office 2010 Starter
• Average Battery Life (in hours) 5 hours
• Lithium Battery Packaging Batteries contained in equipment

OK, which one? One where the screen appears fine, but something else is busted. Doesn't need to be high resolution.