My Dell XPS Red Table can't boot

Hello, my brother went on a vacation and he lent me his computer. I worked with it for about 4 hours and then chose 'Sleep Mode' for it before I went to bed, it worked perfectly at that time, nothing seemed wrong. The next evening, I touched the Start Button on the LCD to turn it on, but it didn't boot. It's all black, no signal. I checked the power cord and everything possible and found that they were all okay. I retouched the Start Button again but it still didn't work. I was getting nervous. I don't remember the full name of that computer, but I remembered that it's Dell XPS, Red, and Table, not laptop. So can anyone please show me how to fix it? Thank you very much. P/S : my mother tongue isn't English, so please forgive me if I made any mistakes.