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I'm afraid it has to do with Apple's firmware on iMacs. A compatible 3rd party memory dealer is RAMJET. From their website, you can see: Apple Computers have proven too demanding for generic PC memory modules. Apple users have been forced to either pay Apple's high prices for upgrades, or buy 3rd party modules and be subjected to system crashes, boot failures, and sub-par performance. Worse still, most 3rd party vendors had no idea that Apple machines demanded a higher standard.
At Ramjet, we start with modules built 100% to Apple's original specifications, but we don't stop there. In our compatibility center, we have a comprehensive array of Apples, every platform built since 1996. Other memory companies try to test for Apple compatibility using generic RAM module testers, whereas we test our RAM in the same Mac you're upgrading.
normal PNY issue, find your receipt and contact pny's rma department, ship it off with RMA number and get a replacement,, the only thing pny is a stickler for is the receipt to prove your original ownership as they don't allow second hand warrenty.. but who's to say who's receipt it is... there is no FIX for this, the ram is notorious for going bad
You may have a bad memory stick. If the two are not exactly the same spec they may not be compatible.
Haev you checked that your motherboard is capable of handling 2gb of memory? And that it is the correct type of memory(size and speed) and that you are placing it in the correct slots(ddr2 only goes in ddr2 slots and ddr only works in ddr)
The power supply makes no real difference to memory, replacing that is not a solution
winlogon.exe has become corrupted....shouldn't be memory related.....try using safe mode to restore your pc from a restore point....alternativly you'll need a boot disk like ERD commander to boot from cd and get to a restore point
SAME HERE Ram installed about 2 years ago I think 2x4gb ddr3 sodimms Failing after a year started as blue screens and not recognized short time after. Without receipt = no warranty Got it as a gift = no warranty Oem = no warranty Purchase with gift card and misplace receipt = no warranty House burn down with all paperwork = no warranty Not good at keeping records =- no warranty I have been in contact with PNY and can you tell they have told me without the receipt they can do nothing for me? COMPLETE WAISTE of the word warranty. and yes there support people get smart with you and quote other companies warranties and state see they do they same thing! WAY TO STAND OUT! Why even have a lifetime warranty, just call it a "prove it" warranty?
This is a limitation of Windows XP. There is no fix. You would have to install Vista to be able to address all 4GB. I would not necessarily recommend this "upgrade" as Vista OS will consume more memory anyway, leaving you less free memory for your applications. The end result may not give you any better performance but there will be much pain in getting everything setup as you had it on XP. On the other hand, if it is a relatively new install and you dont have many customisations, then perhaps the more stable OS would be worth it. Your choice.