”什么“this word has several meanings in Chinese,and in this sentance it means "what" and the whole sentence means"What's the problem with the lamp?",problem=问题,what=什么，lamp=灯.It's a very good question ,I hope I can discuss the word"什么" in more context and find different usages together in the future~Here's the profile:https://www.italki.cn/teacher/5041997

这个灯到底出什么问题了？

what's wrong with the light ?

什么问题：what problem

到底：just emphasizes , like in English : what the hell ......,what on earth

马克, 你想想，这个灯到底出什么问题了？ Mark，think about it/have a think, whatever is wrong with this lamp? 什么：what [[[[ Different from English, Chinese questions do not have to put interrogatives at the beginning of the sentences, you just use the same word order as the declarative sentences. ]]]] 什么花能吃？ 你在看什么？ 你选了什么样式？ [ 到底 ] adv., a tensifier

Hi, in my opinion it means "what ever" -- (smth like "what the heck is wrong with this ?")