I have just recently upgrade my PC from a 256mb 7600GT to a 640mb 8800GTS & I've also upgraded my monitor from a 17" CRT to a 19" LCD.

Ever since installing the new hardware I've been experiencing random crashes where the PC just completely turns itself off.

Also, whenever I go into a hardware demanding game such as Oblivion, Bioshock or Quake Wars there seems to be a really worrying clicking sound coming from inside the PC. I'm sure it's coming from the PSU although I could be wrong.

My system specs are:

OS - Windows XP Pro
CPU - Intel Pentium D 2.8Ghz
RAM - 2gb DDR 2
Video Card - 640mb Nvidia Geforce 8800GTS
PSU - http://www.trust.com/products/default.aspx?item=15317

I have also included a screenshot of a page of Everest which shows voltages, temps etc. Although the +12V says 11.19V I double checked in the BIOS and it's actually reading at 12V so I think that Everest just has the reading wrong.

Anyway, here's the screenshot:

http://img208.imageshack.us/img208/1622/63519735an7.jpg

Can you get voltage measurements in BIOS?

I'd like to see what they are, because if Everest isn't reading the sensor wrong, you've got a power supply problem.

Can you get voltage measurements in BIOS?

I'd like to see what they are, because if Everest isn't reading the sensor wrong, you've got a power supply problem.

I turned off my PC for around 15 mins & actually gave the power lead it's own wall socket as before it was plugged into an extension lead with 2 other leads attached to it. It has been running fine for a couple of hours or so now with no clicking noises or crashes. I even played a hardware demanding game for around 1.5 hours with no problems.

Even so, here is the info you requested:

Vcore - 1.306V
+3.30V - 3.387V
+5.00V - 5.148V
+12.00V - 11.806V

Those numbers look a little better...a crowded outlet/circuit can lead to a 'brown out' (under voltage), which in turn can lead to malfunctioning equipment...