Strange buzzing sound from my Shuttle! Help

[gizmo1990]

Started it up today and was confronted by a buzzing/whirring sound.. I rode it out till the machine had booted and gone into windows, where apon the buzzing slowly started to fade until it had dissappeared.

I've checked all the fans are spinning freely and they are so I guess the main culprit is the psu..? It's a 250w job. I can't remember the model of my Shuttle but its a fairly old (2 years?) G2 model chassis.

Does anyone know if what I've described sounds like my psu is going? Another thing I've noticed recently is that when windows loads I'm getting graphics shearing..? Only at startup where the screen 'shears' intermitantly. Could this point to power spikes or something..? Therefore giving the psu idea more substance?

Any help greatly appreciated.

 

[gizmo1990]

Thanks for the reply Bane.

Hmm it kinda sounds like that but it doesn't appear when the system is under load, like when playing a game. I've just loaded Mass Effect and had a run around and it hasn't come back.

Like I said it just appears at boot up and then gradually fades away. I'm typing from my machine now and it's completely gone.

Any more ideas? I'm a bit twitchy about using the machine now which is extremely annoying since I have a lot of work I need to pull off it.

Is it looking like the psu??

EDIT: I've created a similar thread in the general forum as I think it'll be under more peoples noses there. If a mod thinks this thread here should be deleted please do so.