The test kernel works. It doesn't show the 4 raspberries at the top left but the messages, that are the real important thing, are shown.
Regarding the monitor; I've tested the problem in 3 different FullHD devices (two monitors and a TV, all of them old devices) and none of them works. The only thing I've used in all tests (apart from the Raspberry itself) is the uHDMI to HDMI cable because I only have one. It's an Amazon Basics cable bought in December 2013. It's old and don't meet the newest HDMI specs, so it may be the source of the problem.
The test kernel works. It doesn't show the 4 raspberries at the top left but the messages, that are the real important thing, are shown.
Regarding the monitor; I've tested the problem in 3 different FullHD devices (two monitors and a TV, all of them old devices) and none of them works. The only thing I've used in all tests (apart from the Raspberry itself) is the uHDMI to HDMI cable because I only have one. It's an Amazon Basics cable bought in December 2013. It's old and don't meet the newest HDMI specs, so it may be the source of the problem.