Hard Drvie Failure (twice after network problem!)

Hi I have a MSI K7N2 Delta-L SKT A 8xAGP DDR400 Nforce2 6ch Sound LAN USB 2.0 Motherboard just over a year old.  Whilst networking with my laptop the main pc went into blue screen state but as I was able to carry on with my internet connection I left it for about an hour.  Upon trying to turn on the next morning it would not recognise my hard drive and it was making an awful noise.  I replaced the hard drive and reinstalled windows all ok for the last week (apart from an icon by the clock saying that one LAN connection had limited connectivity issues - my linksys 5 port hub was connected).  However last night I again networked but was unable to access the internet on my laptop - this morning the new drive is making an awful noise and I am getting the same disc read errors??????
Is this likely to mean a new MOBO and if so is it possible that the hard drives r ok but something is wrong with the MOBO?  Also is it likely that the processor, graphics card and ram r damaged??
Thanks in advance...

The power supply has been upgraded 11 month ago due to the machine restarting after upgrading to the MSI board and quicker processorb with no observed faults.  I am running:
Jeantech 400w atx power supply
1 x AMD Athlon XP2500 333FSB 512 L2 Cache Barton Retail Boxed Inc Heatsink & Fan with 3year Warranty
1 x MSI Fx5700-TD128 8x AGP 128MB TV-Out DVI DirectX 9 Retail Box
1 x MSI K7N2 Delta-L SKT A 8xAGP DDR400 Nforce2 6ch Sound LAN USB 2.0 Motherboard
1024mb ram (2x512)
LG DVD rewriter
Plain DVD ROM
Card reader
floppy x 1
160gb Baracuda drive
40gb Maxtor drive
both making bad noises and not being detected at startup by bios
A friend has suggested resetting the bios via the mobo jumper (just gunna check there is 1)
Same fault has happened twice after networking (which had been fine previously) only difference was the blue screen and then the limited connectivity message the second time so i think it is unlikely to be a psu fault as it had been stable for 11 months.  More likely to be mobo is my first impression although it has been great upto now.
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