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Power supply not up to the task

by robtheorg / May 8, 2008 2:55 PM PDT

I have a Sony Vaio Desktop. 512MB RAM, running Windows XP SP2.

It has two optical (DVD) drives, and two hard drives. It also has a double-headed video card, and a USB/Firewire PCI card. All of those things take power (the Video card and USB/Firewire cards have taps into the main power supply).

I am trying to add a Belkin KVM switch so I can use my primary keyboard/mouse and monitor on both my home (the Vaio) and my work pc.

When I connect the PS/2 keyboard, mouse and monitor up to the KVM, and then turn the computer on - the PC starts up, gets past the initial BIOS check, but then reboots - before Windows really has a chance to get started. It isn't just a single reboot - it keeps rebooting over and over again - at the same point. Keyboard doesn't even work to select SAFE MODE.

[Before the KVM install - this computer will run for days, weeks maybe even months before it needs to be restarted]

What I think the issue is - is that this Belkin KVM doesn't have its own power supply (it can be bought separately as an accessory). It is parasitic off of the host computer via the PS/2 or USB port. I think when the KVM goes to suck power at start-up - it puts the machine over the edge - and causes the reboot. Over and over again.

[Already posted something to Belkin, but they are business hrs support only for KVM's]

Is this (sudden reboot) the normal symptom when the power supply is overtaxed?

Thanks in advance for any pointers or suggestions.


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no, it's not the power supply
by ramarc / May 9, 2008 2:09 AM PDT

usb and ps2 components draw very little power. if your pc acts normally with the kvm, then the kvm is obviously the problem.

check your connections and consider swapping out the kvm for a different model. also consider getting a kvm with usb mice/keyboard switching since some PCs are finicky about ps2 components being switched.

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Same issue
by TheManInDboX / May 9, 2008 2:34 AM PDT

I had the same issue, and after months of thinking it was my power supply, and other hardware/software issues i replaced the KVM.. Problem solved.. Try to get one with an external power supply... One that plugs in..

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Helpful to add
by TheManInDboX / May 9, 2008 2:43 AM PDT
In reply to: Same issue

I now use a Switchview MM-1 by avocent...

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I had this happen to me.
by inachu / May 9, 2008 4:54 AM PDT

Turned out even USB device can gobble up too many irq's.

You need to learn about IRQ settings and find an IRQ address that is not being used by your system while the KVM is not plugged in.

Once that is done you can be specific in the BIOS setup and assign the free IRQ to the device.

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IRQ's and KVM
by robtheorg / May 9, 2008 5:06 AM PDT

At this point the KVM is just connecting to PS/2 ports and the monitor.

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