New pc case need help big style

[strac27]

ok iv had this pc for 2 weeks and the display at the top of the case has no light and my windows vista wont let me connect to the internet wirless and my dual layer rewriter wont read disks and it will open and close but not read disks or burn them please help
System spec:-
Pentium D 2.8Ghz CPU
600w PSU
512Mb RAM
250Gb Sata HDD
Dual Layer Rewriter
512Mb ATI Radeon Sapphire X1600 Pro AGP
Windows Vista

Please Help Me