Power supply failure indeed?

I (used to)have a P4HT 3GHz w\ 512MB RAM, ATI Radeon 9200, 1 CDRW drive, 3 IDE hard drives of sizes 13GB, 40GB and 80GB, and one 200Gb SATA hard drive, along with 2 case fans all running on a Turbolink CWT-420ATX labelled 420W max with the following max DC output specs:

+3.3V: 28A
+5.0V: 40A
+12.0V: 18A

-5.0V: 1A
-12.0V: 1A
+5SB: 3A

This system ran without a hint of trouble for about 4 months, except for a couple spontaneous reboots which I'd long forgotten about. A couple days ago, while copying some gigabytes from the 40GB drive to the 80GB drive (with the Win2KSP4 running on the SATA drive) windows complained that C$Mft was inaccessible, then I heard some hard drives turn off, then I got a blue screen saying the login process was terminated, then I rebooted. I wasn't able to boot from that drive. Upon examining the situation using another Win2K installation, I found out that the system partition on the SATA drive had disappeared. I thought it was some software problem, so I conveniently restored the partition from a backup. While trying to do the same copy operation, the system rebooted without any warning this time. Again looking at it, I saw that this time the other (~170GB) partition on the SATA drive had disappeared. (Fortunately nothing terribly important was on it)

Only then I suspected the power supply, and disconnected the SATA drive to reduce the consumption. While looking around on the web for help, I had the system reboot on me once again, with only 3 drives connected.

Right now I have Gigabyte's motherboard monitor utility telling me the +5V rail is +5.24V and the +12V rail is +11.79V. I tried disconnecting and reconeecting 2 more drives and a few fans, but the voltages never went more astray than that.

I just want to confirm that this is indeed a power supply failure. Does it sound like one? Having experienced this, I wouldn't hesitate to pay for an Antec. Although I'm planning to drop the 13GB soon, what kind of a power supply should I get for this system to run well within tolerance limits with 5 HDDs connected? Would this do the trick or should I go for something even bigger?
<A HREF="http://www.newegg.com/app/ViewProductDesc.asp?description=17-103-920&depa=0" target="_new">http://www.newegg.com/app/ViewProductDesc.asp?description=17-103-920&depa=0</A>

Thanks a lot!
5 answers Last reply
More about power supply failure indeed
  1. Before you blame the PSU (voltages are within limits I believe) what kind of drives do you use?
  2. My drives are as follows:
    Quantum Fireball CX13.0A
    Quantum Fireballp AS40.0
    Maxtor 6Y080P0
    Seagate 200GB 7200RPM SATA ST3200822AS

    "What difference does that make?" - Yossarian
  3. Yet another question. Do you have antivirus software installed and updated?
  4. Yes, the system is very clean. I periodically run scans and keep an eye on what processes/services are running.

    "What difference does that make?" - Yossarian
  5. Could anything other than a power supply failure cause the HDDs to turn off?

    "What difference does that make?" - Yossarian
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