so basically, i install windows service pack 2 over the night i went to sleep. Next day i restart my computer, and on the windows xp window (where the logging accounts are) my mous and keyboard stop working, so i restart computer again, then unpluge pluge keyboard and mouse again (ps/2 keyboard and mouse) so i call a friend he told me to unplog and stuff and the other thing he told me is to take out the CMOS battery so i did and put it back on, now my monitor doesn't show anything it goes on the screen turns black. so now everytime i try to turn on my computer a red light turns on next above the CMOS battery i don't know what it is maybe it's the motherboard please help here is mother board info.

Form Factor MicroATX: 9.20 × 8.20 inches (233.68 × 208.28 millimeters)
Processor Support for an Intel® Pentium® 4 processor in an mPGA478 socket with a 400/533 MHz system bus
Support for an Intel® Celeron® processor in an mPGA478 socket with a 400 MHz system bus

Memory Two 184-pin DDR SDRAM Dual Inline Memory Module (DIMM) sockets
Support for single-sided or double-sided DIMMs (DDR333/266/200)
Support for up to two gigabytes (GB) system memory

Chipset Intel® D845GVSR Chipset, consisting of:

Intel® 82845GV Graphics and Memory Controller Hub (GMCH)
Intel® 82801DB I/O Controller Hub (ICH4)
4-Mbit Firmware Hub (FWH)

Video Intel® Extreme Graphics controller
Audio Audio subsystem for AC '97 processing using the Realtek ALC202A codec
I/O Control SMSC LPC47M172 LPC Bus I/O controller
USB Support for USB 2.0 devices
Peripheral Interfaces Up to four USB ports
One serial port
One parallel port
Two IDE interfaces with UDMA 33, ATA-66/100 support
One diskette drive interface
PS/2 keyboard and mouse ports
Three fan connectors

Expansion Capabilities Three PCI bus add-in card connectors (SMBus routed to PCI bus connector 2)
BIOS Intel/AMI BIOS (resident in the 4-Mbit FWH)
Support for Advanced Configuration and Power Interface (ACPI), Plug and Play, and SMBIOS

Instantly Available PC Technology Support for PCI Local Bus Specification Revision 2.2
Suspend to RAM support
Wake on PCI, RS-232, front panel, PS/2 devices, and USB ports

"...i call a friend he told me to unplog and stuff and the other thing he told me is to take out the CMOS battery..."

Sounds like you called the wrong friend. If everything was working until you install SP2, why would you think it's a hardware problem? Since you removed the battery & reset the BIOS, you're gonna have to run thru ALL the BIOS settings & correct them again. What other things did he tell you to do?

It's a Windows problem not your hardware.

AMD Athlon 64 X2 4600+ OC 2.7ghz
2GB Dual Channel DDR 3200
Nvidia 7900GT
SATA II 2x 300gig 7200rpm 16mb cache RAID-0
Gigabyte Nforce 4 SLI