Couple Pc questions

my pc has been acting a bit weird for the last few months, some problems persist even after multiple format/installs.

the system will not shut down, every time I tell it to turn off it simply restarts, I have to use the button to power down every time.

also my Bios Screen background color is orange…not blue, I dont know when this started but I dont ever recall seeing bios in any color but blue.

hmm thought I had another one, well if I remember it I will post it here. but for the above 2 any thoughts would help, I have run several virus scans/antispyware and come up blank but I am worried some how my bios is corrupted.

Are you running Windows XP?

What PC/motherboard and BIOS type/version do you have?
Making sure you have the latest BIOS flashed in is a good first step.