I have just bought a new PC from Carerra (AMD 64 3400+, 1GB Ram, Geforce 6800 Ultra, 2x 120Gb SATA HDD, Sony Multiburner). I had no problems for a week, until I added a new NEC 3500A DVD-RW drive and a new IDE HDD. I then found that everytime I switched the PC on it made a funny "wirr wirr" noise; as if it was struggling. After a couple of seconds, it resumes as normal. Now, I thought that this was down to power, so I changed the PSU and put in a 520W instead of the measly 350W they had originally put in. When I started the PC up with the new PSU, the same noises occured. Any ideas?
One other thing- the PC has 2 80mm fans in it, connected through the molex connectors from the PSU, not on the motherboard)
Unfortunately I did not explain properly. The so-called "new" ATA HDD was not "new". It was in my old PC, but is a Seagate and is only 4 months old. It makes less noise than the brand new Maxtor SATA drives.
There is no cable/fan fouling as far as I can see or hear. It is not this sort of noise. I have also tried both the "new" HDD and the new DVD-RW in another PC at work, but they do not make any noise in the new system I tried them in.
The only thing I can think of is a cable fouling in the 80mm fan in the front of the case. But why isn't it doing this all the time. (The noise stops after 2 or 3 seconds, and only when the system has been off for a long time, not after a restart etc.)