Originally Posted by SECS
Check the PSU..... Have a sniff of it to see if thats burning.
Probally the cheapest/easiest part to replace
If it's in a cheapo case it's very likely, as the PSU's you get in 20 quid ATX cases generally only last 6-12 months, especially out here we get loads of surges and power cuts and ive had two go. invested in a decent quality one and its been fine for 18 months