Hi Andy, It seems the ‘Dell’ logo screen is not appearing when you power on the system. you may start tapping / as soon as you power on the system to access the options.  Hope this helps. Keep me posted with the results. I will be glad to assist further. 
Hello everyone I have recently bought "DELL INSPIRON 15R SE 7520(i7)" laptop.Its the top model. I hate win8 for starters, but that is not the main issue. It takes nearly 5 minutes to boot up before the laptop is functionable. It often hangs and is like working on an old 286 machine with a 33mhz processor.. i think that may have been faster. Just installing all the new recommended chipsets and drivers but other hep welcomed. Many thanks A
Inspiron 15r SE win8 i7 Runs slower than my single core laptop from 2004 !! 
What's up ?