Does this sound like a PSU fault?

[Muncher]

I've started getting a few faults from my PC and I'm thinking it may be power supply related.

The errors are:

- Intermittant failure to boot, no monitor output and no beeps
- A two tone siren while in windows that will stop eventually
- Onboard NIC failing to detect a network for no reason

A quick google suggests that beep code is overheating or voltage related. I have checked the CPU temperature and that seems quite normal to me, fans are working without issue.

The powersupply is probably 8 years old now, but most of the other hardware is a little newer (Abit AB9 Pro, Core 2 Duo E6600, 4GB RAM).

Is it worth changing the powersupply as a first step? If so, what is the best replacement to go with? I don't really use the PC for anything heavy at all these days so it just needs to be vaguely futureproof and quiet really.

 

[Muncher]

Looks very much like it is the power supply. The 3 orange 3.3v connectors on the ATX connector have gone brown, the connector on the motherboard is also a little discoloured but seems intact.

 

[Muncher]

Hmm, got the new power supply and it's not working at all now

I'm getting 1 long beep followed by 3 shorter ones and then it powers off straight away. The Motherboard code is showing code 87 which is CPU voltage.

Am I right in thinking the 3 discoloured connectors at the right hand end of the motherboard connector are the ones supplying the 3.3v cpu voltage?

Is there anything else I can try before buying a new motherboard and CPU? The only things I had done was reseat the graphics card and removed and re-installed the heatsink.

 

[Muncher]

Would I be better off spending £60-70 getting a replacement motherboard to take my old E6600 or would it be more cost effective to buy a more modern motherboard, faster CPU and 4GB of faster RAM?

I don't really use the PC for anything that intensive anymore, just web browsing, email, AV, watching films really so it seems a bit of a waste.