showing posts tagged with 'hardware'
1 · 2 · 3
by lunarg on May 29th 2013, at 12:38

If you have an HP Officejet Pro 8500, and have issues with your prints not maintaining the page layout (portrait or landscape), try enabling Print directly to printer in the printer properties.

by lunarg on October 8th 2012, at 16:32
It's quite easy to accidentally disable the touchpad on a HP Probook 4520s: double-tapping the left-top corner of the touchpad triggers the enable/disable switch. A LED indicates whether the touchpad is on or off: when the LED is lit, it means the touchpad is disabled, and vice-versa.

Users who are not aware of this feature can be looking to re-enable the touchpad for quite some time. A customer had a similar issue, and I was unaware the touchpad switch was actually built in the touchpad itself.

To re-enable the touchpad, all he had to do was double-tap the LED in the left-top corner. From a design perspective, it's quite neat, but not really user-friendly, or do we really have to read t  ...
by lunarg on July 6th 2012, at 11:49
At a client running a Trapeze/Juniper network with some MX-8 controllers, a bunch of MP-371B and an instance of Ringmaster software to control and configure it all, we were working on implementing MAC-address based authentication for one of their ESSIDs. After correctly setting up the necessary policies, and AAA servers, we noticed that any client could still connect to our network, despite all settings being correct.

Baffled at this, we started to look around, trying to figure out what went wrong. My collegue finally remembered the true cause for our problem, a setting in the Wireless Service Profile.

There, the Fall Through Access was set to last resort, which basically tells the network  ...
by lunarg on August 31st 2011, at 17:20

Try downloading octy's GPSopt application. It's available free of charge at Google Market.

It resolves the slow signal acquisition of the Samsung's GT-i5801 (perhaps on other phones as well). I use it together with GPSstatus (also available at Google Market) and no longer have GPS signal issues.

by lunarg on February 16th 2011, at 16:53
To reset the printer (does not reset the Jetdirect network card), turn off the printer. Upon turning it back on, immediate press and hold the green go button for at least 10 seconds but no more than 20. During that time, the attention light will go on. When that happens, release the button and the printer will cold reset.

Resetting the network card is done a little differently. With the printer in the ready state, press and hold the rotate carousel button and the cancel job button at the same time for a few seconds, then release it. This will reset the card to factory defaults (BOOTP/DHCP, no management password). If a network cable was inserted, you'll notice the LED at the NIC port   ...
by lunarg on December 16th 2010, at 15:57

For an easy to use disk erasing tool:

It's pretty important when you retire your old computer that you securely delete the contents of your hard disk. Even with a regular format, it is still possible to retrieve a lot of data from the disk. DBAN can help you with that.

by lunarg on October 21st 2010, at 12:19
If you're having trouble with your Mac and think the cause could be hardware-related, you can run the Apple Hardware Test. It's a set of tools by Apple which perform basic and extensive tests on your hardware to see whether they are still okay. These tools are available for anyone with a Mac, and are either preinstalled on your system, or available through your OS'es installation discs.

Applies usually to older models of Mac.

You can download the AHT disc images for a number of older Mac models through here:

Insert the Apple Hardware Test disc into the CD drive.

Upon starting/restarting your Mac, immediately press and hold C on your keyboard. K  ...
by lunarg on October 19th 2010, at 16:36

A list of IEC power cable connectors, useful as a resource for ordering spare parts:

by lunarg on September 14th 2010, at 11:56
Ever so often, when a hardware device fails or gets replaced by another, the old one still slumbers in the deep abyss that is Windows. Usually, this is not really a problem as the unused device only takes up disk space in the form of drivers and/or support software.
In case of network equipment, that's another story. Setting a static IP on a network adapter, replacing it with another, then setting the same static address on the replacement invokes a confusing warning message. In case of 2008 SBS, it gets even worse as running certain wizards will barf out errors about not being the primary adapter, not having a static address, and so on.

Getting rid of those pesky ghost devices is not easy:  ...
by lunarg on August 6th 2010, at 13:48
At work, we've been working with the HP t55xx series thin-clients, mainly for one of our customers.
This article contains some things we've found to be very useful. It is not a real howto, but rather a collection of smaller items, telling you how to do certain things, and those things are not easy to find in the manuals.

There are 4 ways to reset a t5530 to factory defaults:

Open Control Panel, open the System applet, then click on the button that says Reset.

When powered off, press and hold the F9 key on your keyboard, then power up the device, and keep it pressed, until the system has booted. You will be greeted with the first-run wizard again. Note that this does not w  ...
by lunarg on July 5th 2010, at 16:47

The latest MIBs for APC's PowerNet SNMP is available here:

by lunarg on June 30th 2010, at 18:04
Ever so often, owners of a HP Laserjet 1020 or 1022 may run into a problem with the print spooler crashing over and over for no apparent reason. Restarting the spooler causes an immediate crash, and the only way to get rid of the problem is by removing (sometimes by force) all printers. The observant type has already noticed (the title of this post says it all) that the common dominator is indeed the 1020/1022 printer, and that the problem usually occurs upon attempting to print one or another PDF document.

In truth, the problem is caused by newer versions of the HP Host-based printer driver. For some reason, a part of the HP driver crashes upon parsing certain PDF documents (usually scan  ...
by lunarg on March 3rd 2010, at 17:48
Suppose you have an APC UPS and have just purchased a battery pack to go with it. Connecting the battery pack is pretty straightforward, but did you know you need to tell your UPS that an additional battery pack has been installed? Setting this in your UPS, optimizes the usage of the entire battery capacity.

If you are using PowerChute software, and have connected the UPS to a computer using serial, USB or network interface, you will be able to set this parameter in the software.

Log into the management card using your web browser (default user and password: apc).

Navigate to UPS, and inside Configuration, select General.

Set the correct battery pack number and click on the Apply button   ...
by lunarg on February 24th 2010, at 19:26

Finally got the final parts of my computer: the HD's.

Currently, I was using an old HD (a Maxtor 500GB) from my previous system. The idea with the new disks is to set up two Raptors in a RAID0 configuration. As Raptors are already fairly fast, the additional RAID0 - I've been using this method a few years already - should give it an extra edge.
I'm keeping the old HD in to have additional 500 GB of pure storage (like downloads and such, things that don't need the speed).

by lunarg on December 15th 2009, at 21:08
Going forward with plans for a new gaming computer, I've ordered the components. I didn't really have a specific budget in mind, other than the fact that I'm going for quality and performance, rather than selecting components based on their price.

Case: the case is an Antec Twelve Hundred gaming case. I always wanted to select a gaming case for the next one, but a nine hundred would have been just fine. The only reason why it's a twelve hundred is because of a wrong delivery a few months back, where the Antec PSU being delivered was an EC one (thus only fits in a select few cases of Antec).
The PSU is an Antec EC-850W, which is enough for now.

Motherboard: will be an Asus Rampage II Extrem  ...
by lunarg on December 14th 2009, at 23:26

Crap! Looks like my 8800GTX video card is broken. That's a serious bummer.

The card does some very serious funny things: as soon as going in-game, the card doesn't really freeze up, but has some sort of memory corruption problem, which remains throughout reboots.

Very coincidentally, I just ordered new hardware for my new gaming computer. The only thing not being replaced was the video card, because I thought it would be better to just wait a while until the next generation of cards from nVidia were available.
Apparently, Fate has decided otherwise.

by lunarg on December 6th 2009, at 20:30
For all those who recently acquired a WET54G (rev 3.1), or are planning on acquiring one, should read the problem I had with it.
The problem only affects EU versions of the product, as the US version has a more recent firmware available which fixes the problem.

Update: there's still no new firmware. I've updated the links so they are correct again.
And here's a direct link is here.

Anyway, the main symptom is the lock up of the device as soon as a connection with a wireless network has been made, and that network uses WPA-PSK or WPA2-PSK. I've tested this out extensively, and with different units, so I'm pretty sure it's a bug in the firmware.

Since the EU do  ...
by lunarg on May 17th 2009, at 12:41

During the course of the lifetime of a Windows Installation, you're bound to stack up on one or more devices that no longer exist. Additionally, some device (existing or not) with an attitude, could very well make your life a living hell.
Luckily, there's a solution, with this cool software:

by lunarg on April 29th 2009, at 19:48
Acquired a new appliance from Mini-ITX, which is to replace my current WRT54GL (flashed with OpenWRT White Russian).

Specs of the thing are:

Durable industry-standards housing, including a mount bracket for 2.5" disks

2x 1000 Ethernet, 4x 10/100 Ethernet, 2x USB 2.0, VGA, PS/2

VIA chipset with a VIA Eden 1ghz CPU, 1x DDR2 slot, 1x CF slot

1x IDE 2.5" port, 1x SATA port

I've equipped it with 512 MB RAM (standard was 256 MB), and a 4 GB CF card, and installed Debian Lenny i686 on it.

Because of the fact it's CF, I've tweaked the initramfs image of Debian so it uses overlaying for /var and /etc (using aufs) in RAMDISK, and mounting / as read-only. This allows me to save the f  ...
1 · 2 · 3
showing posts tagged with 'hardware'