1993 jaguar xj6

Well,if there is anyone out there who knows anything about jaguars,please help! I have a 93 jagxj6 with only 72000 miles. It`s a sweet car,but.......in the last year or so,it squeals and you hear a metal clanking/grinding noise when started after it has been sitting a few hours.It gets worse when I turn on the A/C or touch the brake pedal or turn on the lights. It does this only till warmed up..have replaced the power steering pump...nothing. The compressor..again,nothing,the alternator...still nothing..and new belts,to no avail. WTH could it be!?!? I`m frustrated and puzzled. Lets see if anyone can figure this out. Mahalo from Hawaii...crappiehunter62@hotmail.com