Answer to "mother board PCI/PCI-e test"Because Lenovo has garbage software, uninstall it. Your hardware is fine. The same thing is happening to a great many y700 owners.
Answer to "Intel(R) HD Graphics 530"*EDIT There is now an update for the IGP 530 that will fix the test failure and "mathematical error." To update do the following. Windows 7, 8, 8.1 and 10 Right click the "start" icon on the bottom left Click "device manager" In device manager click on "Display adapters" Right click on "Intel(R) HD Graphics 530" Click "Update driver software" In the popup window chose "Search automatically for updated driver software" Windows will update the driver.* It has to do with the driver from Lenovo for the IGP 530 and the failure that is pretty much any piece of Lenovo software. You can try updating the video driver but Lenovo hasnt released a new one for quite some time and the BioS update they finally released addresses basically nothing at all. There is nothing wrong with your hardware and there is nothing to worry about. Uninstall any Lenovo preinstalled software and you wont have to worry about it anymore. On my y700 the LSC and QuickOptimizer apps give me an instant BSOD. Uninstalled, no more issues....