I'm not sure if this is the right place, please let me know if i'm wrong. I bought iMac G4 700 at ebay recently. The iMac is nice and I love the sound from apple pro speakers. It had only 256M ram, and I thought it's way small to go with Tiger. So, I bought 512M ram at ebay. The nightmare started here. The one I bought was http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270153317326&sspagename=ADME:X:AAQ:US:11 It took 11 days to receive the ram from OH to MI. Maybe they use carrier pigeon to ship, but its OK. The ram didnt work, wasnt even recognized in my iMac. So, I emailed seller its not working and send me a new one. Then, I got a reply like this. Hello, The module you ordered is high density (dual in line 64x8, if your laptop only supports low density module (32x8) this could be the problem. We must have the make and model of your laptop in order to rule out a compatibility problem. If you do not provide us this information we will have no choice but to assume that you ordered incompatible memory and proceed as such. If compatibility is the problem you can either upgrade to a compatible low density module for an addition $45 USD Each which includes shipping, or receive a refund according to our refunds policy (see Ebay) for your returned item. If it is bot a compatibility issue we will be happy to send you a free replacement. My questions are, 1. Is this guy telling a truth? Are there 2 types of 512MB SDRAM SODIMM PC133 512 MB M 133 Mhz 144PIN and does my iMac only take Low Density ones? 2. If this guy is right, what is the best option? a. Fight to get back to full refund. b. Proceed his return policy. (He will not return shipping, ebay posting fee, etc.), and buy new one from more reliable seller. c. Buy his $45 upgrade d. Keep this high density ram and sell it at ebay to another victim, and buy a new one from more reliable seller. Please tell me what you think. Thanks.