I've acouted arround on the net for people with a similar problem (of which there are many) and unfortunatly the general consensus is that it could be any number of things, I only hope that by providing you guys with all this info it could narrow it down.
Incedently the computer just rebooted, I hoped straight into the bios to check the tempreature, the cpu is 51c and the system is 34c.
Now my theory is that the mother board in beggered, going by the fact that the sound is also not working.
thankyou in advance for your help, this is really driving me up the wall.
Processor
Model : AMD Athlon 64 X2 Dual Core Processor 3800+
Speed : 2.00GHz
Mainboard
Model: MS7191
RS482M4-ILD
Total Memory : 2GB DDR-SDRAM
Chipset 1
Model : ATI Technologies Inc RS480 Host Bridge
Front Side Bus Speed : 2x 1000MHz (2000MHz data rate)
Memory Bus Speed : 2x 200MHz (400MHz data rate)
Chipset 2
Model : Advanced Micro Devices (AMD) Athlon 64 / Opteron HyperTransport Technology Configuration
Front Side Bus Speed : 2x 1000MHz (2000MHz data rate)
Total Memory : 2GB DDR-SDRAM
Memory Bus Speed : 2x 166MHz (332MHz data rate)
Video System
Adapter : NVIDIA GeForce 8800 GTS
Physical Storage Devices
Hard Disk : WDC WD1600JD-00HBB0 ATA Device (149GB)
Hard Disk : WDC WD800BB-00JHC0 ATA Device (75GB)
CD-ROM/DVD : DVDRW 16X16X ATA Device (CD 48X Rd, 48X Wr) (DVD 6X Rd, 6X Wr)
Logical Storage Devices
Hard Disk (C:) : 149GB (134GB, 90% Free Space) (NTFS)
Hard Disk (D:) : 75GB (74GB, 99% Free Space) (NTFS)
CD-ROM/DVD (E:) : N/A
Operating System(s)
Windows System : Microsoft Windows Vista Professional Media Center x64 Edition 6.00.6000
Tagan TG800-U25 800W PSU