I have a Compaq Presario SR5610F with an upgraded power supply (Antek 500 watt) and Vista 32 bit. I purchased an ALFA 802.11 b/g usb network adapter which is based on the Realtek RTL8187L Chipset. Here's the problem. When I plug the adapter into the USB port (doesn't matter which one) and load the drivers, the adapter just cycles on and off. Meaning it appears and disappears on the computer constantly at a rate of about once per second.

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If you have the device manager open, it appears and disappears under network adapters. I've tried every driver I can find. I even let windows choose the driver from Windows update. I did a complete system restore (using a different hard drive) back to factory new condition. Made no difference. Tried a different adapter, did the same thing.

Is there some sort of incompatibility with this presario and the 8187 chipset? HI, wrote: I've tried the latest drivers from Realtek as well. I've tried a total of 17 different drivers. New ones, old ones, XP drivers, Vista drivers, win7 drivers.

The ones that will load on my system all have the same effect. The constant cycling on and off about once a second. Have you tested the ports on your desktop with a mouse or a keyboard?

Use a simple USB devivce. Try testing the USB network adapter on another PC with the same operating system. The problem will be the device itself if you have tested the ports and the ports are working.This is all about isolatioon to find a root cause. Best regards, erico.

ImaginaryKaos wrote:The ports are working properly. My keyboard and mouse are both USB. I have a Linksys USB adapter that works just fine in any of the ports. It seems to be some sort of incompatibility with the Realek chipset and/or drivers. The 'cycling' effect does not occur until after the drivers are loaded. If you plug the device in without any drivers loaded, it doesn't cycle on and off.

Hello ImaginaryKaos, It appears you may have a defective product. Here are the specifications listed for this device. ALFA 802.11g wireless USB adapter.

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HIi wrote: I could understand if one of these adapters produced this problem, but three of them? Three different adapters reacted the same when plugged into any of the USB ports.

The constant cycling on and off. Could they simply be drawing too much current from the port? They are supposed to be rated at 500ma (different from 1000mw), but who knows? That would certainly be max power capacity on the ports on my ASUS Rampage Formula desktop motherboard. You can check the current at the USB port. In Device manager. Look for Universal Serial Bus Controller device and expand it.

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