Long story short: I bought a new mb thinking that was at fault, but after stripping the pc down I noticed a slightly burnt smell from the psu, so in the interests of playing it safe I am going to replace the psu. Not that I mind too much it is about 2-3 years old, my pc is constantly at 100% load when it is on (12-16hrs a day) and was only about £35 at the time for those that are interested it is the 700w fsp one that pops up on scans today only quite regularly.
Now I haven't bought a psu in a while and was hoping for some info on what is considered good these days was looking to spend £50-70 and it needs to supply reliable power for my rig that is:
Q6600 (previously at 3.6, mostly run at 3.4 for heat reasons but I got a new wb so will see how high this baby goes)
Gigabyte x48-ds5
Radeon 4850 512mb lightly oc'ed
6gb ddr2
Audigy
12v pump
DVD writer
Br reader
3 hdds
5 120mm fans