I have an ageing Inspiron 1750 which has developed intermittent but frequent failure to start up.  I've replaced the HDD with a new SSD and a clean installation of Windows 10 so it's not a Windows problem.  Runs fine when it's started but will often take many hard shut down and restart attempts with a grey screen most times. Eventually I'll get the Set Up/Boot options screen and it'll start from there. I've completely stripped it apart and checked the MoBo for any obvious bad connections etc. but can't see anything.  But I'm assuming I have a hardware MoBo, maybe BIOS problem and don't know how to test to find/fix the problems.  Any suggestions welcomed please.